^+1 for waiting for the 4770
The 4850 won't have a problem playing Crysis on High at that resolution, but if you want Very High then that's another matter. The 4770 will offer performance very close to the 4850 for less. If you have a crossfire board you can also always just add another one down the line for even more performance. If you only have a single slot and want to get the best GPU for it then look for a sale on a 4870, or 260 (preferably the sp 216). Right now this 4870 512MB comes in at 154.99 with a mail in rebate
HIS Hightech H487FN512Phttp://www.newegg.com/Product/Product.aspx?Item=N82E16814161268
Thanks to the launch of the 4890 and the announcement of the 275, I think the prices of 4870 1GBs and 260 sp 216s will be forced down a bit, if you're willing to wait for it anyway. If you want something today, then get that 4870, but I say just wait a little bit.