If you plan on throwing in another 9600GT for SLI the rig should last you awhile. The E2200 should overclock to at least over 3ghz... Personally I'm not a big fan of the new nvidia chipsets, but 9600GT cards in SLI have proven to be very nice performers so in this case I would recommend it
As for crysis, you will most likely need to put the shaders on medium if you want it to play smoothly....but you may get away with high. If you have SLI you will play with high settings no problem. (forget very high).
Also if you want an upgrade in the future you can always switch to a quadcore and upgrade your video card.