What resoloution will you be playing in?
What price range and from where? Prices vary wildly according to supplier and country.
Really the 9600 is too weak to play Crysis at all but low resoloutions and medium/low details.
For a better experience look to the 9800GT, 9800GTX, 9800GTX+ or GTS250 (low to high) from Nvidia or HD4830, HD4770 or HD4850 from ATI (again low to high).
And make sure your new system has enough power.
Check out the framerates here:http://www.techpowerup.com/reviews/Albatron/HD_4830_Green/