Is this setup enough?

I am afraid you will have a little problem with Crysis. I think you need to think about upgrading your card. All your componets are getting a little dated, but mainly your graphics card. Crysis came out when the 9800's were comming out and were geared for them, but you can also choose a 4850 or 4870 if you like, they will work with your PSU you currently have...