What do you consider acceptable performance?
At least a solid 60FPS. I can really tell the difference when something drops from 60 down to 30-40, and although when I look at it, it's still running at an OK rate, I feel as though I'm watching a slideshow. That's just me.
Those proud owners of 550/560 have every reason to be proud, they pay good price for good performance
We'll see, I ordered another rig with an i7 2600k and a GTX550Ti mainly to test it out. I'm going to be handing that over to my mother, afterwards.
Why didn't you go all the way with a GTX580 in the first place?
Probably because when I purchased my PC, I was originally going to go with two HD6870s in crossfire.
Guy convinced me to go with a single GTX570 and I hadn't done my research on nVidia cards, as I never really was a fan, so I just quickly looked at some benchmark scores and the GTX570 outperformed a single HD6870, and I didn't exactly want Dual GPUs that much either. Thus I decided to take a GTX570. The GTX580 would have cost me more anyway, and I'd still replace it considering it's only slightly better than the GTX570.
Thinking about it further, I might go for 2 GTX 680s, perhaps even 4-Way SLI if I have the money to spare, just for some futureproofing on the GPU.