Q: I think the game would lag but I'm looking for a cheaper graphics card.
A: Crysis will run on a Geforce 9500GT but yes you are correct.. it will lag, unless you set it on the low to medium settings. I would recommend adding a few more bucks and getting yourself a Geforce 8800GT for around $100-$120. FYI, Crysis is very hardware demanding and it gives a workout on even the best gaming systems out there.