Did a quick search and didn't see this anywhere, but I grabbed one for my HTPC and may use it in my cab as well:
Lenovo KeyboardI got it on sale a bit ago for $40. It's a solid build and works fairly well. Even has a function key to do a CTRL-ALT-DEL. I'm going to set it up so F1 keys get sent via key press combinations using AHK (if I find it necessary) for the cab...should work well.