The GeForce 8500 is an okay video card but it's pretty anemic for running Crysis.
I'd recommend one of these:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150295We have them in all of our systems we sell where I work. We do 3D imaging
and sell our own 3D visualization/analysis/simulation software to the medical
professions. These cards perform very well for our needs.
I've run Crysis on my workstation at work (2.3Ghz Core 2 Duo, 2GB RAM) and
it works pretty well if you turn down the requirements.
One thing left out is that you need at least a 450watt power supply and I'd
go with a 650. That way you have plenty of head room and you won't have
to change it out for a good while. It will also have the plugs you will need
that your old PSU won't have.
Good luck with whatever you decide (or decided) on.