What are the options for mounting 24×34 wedding-portrait prints?

In about four months, I have a wedding shoot coming up. The couple has requested a 24×34 print. I usually order my 20×30’s on a Single & Double Weight Matboard, but I feel like the print itself can easily be scratched. Many local photographers print on a type of foam mount that has a water resistant print that feels like plastic when touched. It’s something I might want to go for. What other options, pros and cons, should I be considering?