I have a choice of two PC's, both at around £870. One has an i5 3570k, 8gb ram, 1 tb HDD and a gtx 680. The other has an i7 3770k, 16gb ram, 2tb hdd and a gtx 670. Which is better. USES: GAMING.
Hyperthreading is not really used for gaming atm so the 680 build will more likely have an advantage. if one wanted a better cpu, then theres normally a jump from i5 to sandy/ivybridge-e 6 core rather than 4 core + HT. but the gains are very minimal.
Dude, get the i5 PC. It has a better GPU which is super important for gaming. Anyway, like dudewitbow said, hyper-threading capabilities don't help gaming at all. If it is a computer primarily for gaming, I would almost always suggest the one with the more powerful video card.