also why i5 over i7? i have an i5 like the one you suggested in my current pc, can i transfer that one to my new mobo? also is the 680 better than 2 570s?
You don't need it on an HTPC / Gaming rig as you're most likely not going to use anything that requires hyper threading - put that money in the GPU - that's where it really counts, especially if you're going to be hooking up your rig to any sort of LCD / LED. Media playback actually doesn't require a 2600K - you can get by with far less.