I don't need a quad-core for HTPC or simple gaming, especially since I don't need 1920x1080 resolution?
Spend some extra money on a 2500k if you plan to overclock your cpu. Also spend some more money one a 560ti or something from nVida because there software for games is superior to ATI. And if you can squeeze the extra cash in, get a WD blakc hardrive, it will benifit you!
I'd say get the 560 Ti. I have the EVGA version, which is on a rebate (until tomorrow) for $229.99 CAD. Also comes with Batman Arkham City when it is released. EVGA is one of the best GPU makers. Don't take my word, check out the reviews!