Well, I figured that, I just wouldn't think that the games you listed woudl have trouble on a 280X. If your GTX 480 is handling what you play at 60 FPS, I'm sure a 280X would as well. The issue woudl just be one of future-proofing, which is where my point of "what do you want to spend?" kicks in. I don't know what you play on for a resolution, but here's the 280X review so you can get some numbers at different resolutions and for different games:
http://www.anandtech.com/show/7400/t...-feat-asus-xfx
You're pretty-much set up to 1080p, but it starts getting into the high 40's up above 1080p on the 280X. Then again, if you look at the 290's review (
http://www.anandtech.com/show/7481/t...9-290-review/8), it drops under 60 FPS over 1080p as well in some cases, and the 290X is only a few FPS higher than it.
Personally, I'd still go 280X, since I wont' game over 1080p. If you want to do so yourself, I think the 290 with a non-reference cooler is probably better than a bunch more money for a few FPS on the 290X, which will start to struggle to hit 60 FPS about the same time the 290 will.