Should we invest some of our savings to protect against inflation?

Are there still people who keep significant amounts of money in a bank savings account? You could get ~1% by just choosing the right bank. ING Direct, for example, gives 0.8%, 4 times more than your credit union, with the same FDIC insurance!

If you do want to invest in something slightly more long-term, you can get a CD. At the same ING Direct, you can get a 5-year CD with 1% APR. Comes with the same FDIC insurance. Note that I mention ING Direct just because I accidentally had their site open right in front of me, their rates are definitely not the highest right now.

If you want to give up the FDIC insurance and take some more risks, you can invest your money in municipal bonds or various kinds of "low risk" mutual funds, which may yield 3-5% a year.

If you want to take even more risks - there's a whole stock market available for you, with ETF's, mutual funds and individual stocks.

Whether you should - that only you can tell. But you can have a NO-RISK investment yielding 4-5 times more than what you have right now, just saying.

If I were in your shoes (I would be extremely happy), here's what I would do:

Get on a detailed budget, if you aren't doing one already. (I read the comments and you seemed unsure about certain things.) Once you know where your money is going, you can do a much better job of saving it.

Retirement Savings: Contribute up to the employer match on the 401(k)s, if it's greater than the 5% you are already contributing.

Open a Roth IRA account for each of you and make the max contribution (around $5k each). I would also suggest finding a financial adviser (w/ the heart of a teacher) to recommend/direct your mutual fund investing in those Roth IRAs and in your regular mutual fund investments.

Emergency Fund With the $85k savings, take it down to a six month emergency fund. To calculate your emergency fund, look at what your necessary expenses are for a month, then multiply it by six. You could place that six month emergency fund in ING Direct as littleadv suggested. That's where we have our emergency funds and long term savings. This is a bare-minimum type budget, and is based on something like losing your job - in which case, you don't need to go to starbucks 5 times a week (I don't know if you do or not, but that is an easy example for me to use). You should have something left over, unless your basic expenses are above $7083/mo.

Non-retirement Investing: Whatever is left over from the $85k, start investing with it. (I suggest you look into mutual funds) it. Some may say buy stocks, but individual stocks are very risky and you could lose your shirt if you don't know what you're doing. Mutual funds typically are comprised of many stocks, and you earn based on their collective performance.

You have done very well, and I'm very excited for you.

Child's College Savings: If you guys decide to expand your family with a child, you'll want to fund what's typically called a 529 plan to fund his or her college education. The money grows tax free and is only taxed when used for non-education expenses. You would fund this for the max contribution each year as well (currently $2k; but that could change depending on how the Bush Tax cuts are handled at the end of this year).

Other resources to check out: The Total Money Makeover by Dave Ramsey and the Dave Ramsey Show podcast.

Okay. Savings-in-a-nutshell.

So, take at least year's worth of rent - $30k or so, maybe more for additional expenses. That's your core emergency fund for when you lose your job or total a few cars or something. Keep it in a good savings account, maybe a CD ladder - but the point is it's liquid, and you can get it when you need it in case of emergency. Replenish it immediately after using it. You may lose a little cash to inflation, but you need liquidity to protect you from risk. It is worth it.

The rest is long-term savings, probably for retirement, or possibly for a down payment on a home. A blended set of stocks and bonds is appropriate, with stocks storing most of it. If saving for retirement, you may want to put the stocks in a tax-deferred account (if only for the reduced paperwork! egads, stocks generate so much!). Having some money (especially bonds) in something like a Roth IRA or a non-tax-advantaged account is also useful as a backup emergency fund, because you can withdraw it without penalties.

Take the money out of stocks gradually when you are approaching the time when you use the money. If it's closer than five years, don't use stocks; your money should be mostly-bonds when you're about to use it. (And not 30-year bonds or anything like that either. Those are sensitive to interest rates in the short term. You should have bonds that mature approximately the same time you're going to use them. Keep an eye on that if you're using bond funds, which continually roll over.)

That's basically how any savings goal should work. Retirement is a little special because it's sort of like 20 years' worth of savings goals (so you don't want all your savings in bonds at the beginning), and because you can get fancy tax-deferred accounts, but otherwise it's about the same thing. College savings? Likewise.

There are tools available to help you with this. An asset allocation calculator can be found from a variety of sources, including most investment firms. You can use a target-date fund for something this if you'd like automation. There are also a couple things like, say, "Vanguard LifeStrategy funds" (from Vanguard) which target other savings goals. You may be able to understand the way these sorts of instruments function more easily than you could other investments. You could do a decent job for yourself by just opening up an account at Vanguard, using their online tool, and pouring your money into the stuff they recommend.