Re: Good build?
My reply is based on Atari's.
those two hard drives would be fine performance wise by themselves too, no reason to go RAID 0 with them, the benefits won't be there for most of the tasks someone would do on a desktop PC. The heatsink is overkill, you don't even need to spend money on an aftermarket heatsink unless you intend to overclock. If you must buy an aftermarket heatsink, go for a Hyper 212. Great cost, even better performance, and you can use it on just about anyone's CPU (Intel OR AMD)
I disagree with the CPU choice too, there's no reason to get the 1366 CPU at this point when a 1155 CPU should be more than enough in an i3 or i5 CPU. Even AMD's Phenom II X4's are great as long as you pair them with good mobo.