Completely.
I bought them about a month apart, and I actually won the motherboard in a contest, but if I was going to upgrade anyway, which I probably would have, I still would have gone the same way.
The i52500K is at 5.1Ghz 100% stable, and the 560ti Twin FrozrII is at 960/2100, with stock volts, but when running benches I push the volts 60mv and get it a bit over 1ghz.
I game, mostly BC2, which I pull between 55 and 60 (vsync on), Portal 2, which uses about 40% of power and gets about 250-350fps with Vsync off.
Other games I haven't actually benched are GTAIV, DiRT2, FalloutNV and GRID. Don't know exact frames, but all run flawlessly on full settings.
Aside from gaming, I usually run F@H on my GPU, and it gets about 850-950ns/sec, or about 5000PPD estimated
When encoding videos on the CPU, frame rate of converting a standard 700mb .avi DVDRIP to mp4 preset, it pulls anywhere from 270-380fps, so gets done in about 7-10 minutes.
Converting UP in 1080p mkv to mp4 standard definition preset is about 20fps at 5.1Ghz.
A lot of people will say "why not get the 6950 you faggot?" but they are usually faggots with no concern of anything except what has the longer bar in benchmarks.
I chose the 560 over the 6950, because they were so close in price and performance, that for games, it really wouldn't have made a difference, sans 1-3fps, unless you game at over 1080p, in which the 2gb of some of the AMD cards will pull well ahead. But I chose the 560 for PhysX, CUDA, it's performance in F@H, which is about 4x greater than the AMD card, and one with a black PCB was cheaper in a 560 than 6950, and I am vain. I have a nice colour theme going on in my case.