I would personally go for the 670, but the never settle bundle that is included with the 7970 makes is a better deal, if you like the games that are included in it.
I have an xfx 7950 and the performance it great and it over clocks well, but the fans ramp up very high even when playing an older game that's not that stressful, the fans make an annoying rattle when ramped up aswell.
Get an xt, I've heard they there really good. But don't buy a factory over clocked one, its a waste of money. Get one with a good cooler if you're not planning to water cool it( get a reference one if you are) and then over clock it yourself.
Nice colour scheme, Love the carbon fibre, you dont see a lot of 200mm rads, the fromt res really suits the 650d. and I havent even looked at the specs yet LOL
I use a srtyker in my own build and I love it. It looks great and is super easy to work on. and I think it looks better and more distinctive than the switch 810