bccorrupt :
You would need a 750ti to play the majority of games right now on Ultra, but without maxed AA/AF/SS at 1600x900. You would likely need a GTX770 to be able to stay at that same performance for 2 years, at least a GTX760.
He said budget and at 900p a 770 is extremely over kill even with eye candy.
The most expensive card i would recommend is either the 760 or the 280
280: http://www.newegg.com/Product/Product.aspx?Item=N82E16814202099&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=