Since a GTX 460 just failed on me, I am stuck with an old 9600 GT (glad that I kept this as a spare). I have Samsung Syncmaster 932BW 19" 1440 x 900, and will not upgrade until it start flickering or blurring or color-changing. Having said that, I'm looking for an optimal graphics card for this resolution, and cannot choose among GTX 560 / GTX 560 Ti / GTX 560 Ti 448. Since my case/mobo has kind of limited space, I am not considering Radeon. There are pretty good deals for 560 and 560 Ti right now, but if the 448 can make a noticeable difference, I am willing to pay the extra $100 for that. However, at the same time I don't want to pay that much money for mere 5% improvement. Right now the best prices I found are $165 / $190 / $ 290 for each after rebate. I appreciate any meaningful advice/lessons/tips.
Mobo: MSI H67 MA45 (1 PCI-E 16x)
Memory: Corsair 4GB x 2 1333MHz (2 additional slots free)
HDD: Samsung F3 500GB
Case: Antec 300
OS: Windows 7 Ultimate 64
Games: CIV 5, Crysis 2, Witcher 2, Diablo 3, Batman if the DX11 issue resolved, maybe MW3 once I'm done with BF3 on PS3
GTX 560 Ti is considerably faster than GTX 560, especially overclocked versions, which I suggest you get. Their cooling tend to be better.
I am using Gigabyte GTX 560 Ti, and it's working like a bee. I can play all of the games on maximum graphics on full HD (though in some games I have to turn AA down). Although I am pretty happy with, I heard MSI has better cooling solution.