I would say to go for Western Digital HDD's, with either a Velociraptor or a solid state drive as an OS/Boot drive with your games with a second 1TB drive.
Also, get 6 or 8 GB, not just 4 if you can. The weakest link in my system is my lack of speedy RAM mostly.
Also, if you plan on upgrading later to get today's $1000 GFX card in a couple years for $250-$500, make sure you get an adequate power supply. I would say that a 700W is the bare minimum for this kind of plan. I run an 850W, which is more than I could probably ever need, and it didn't cost that much more at the time.
Also, don't stick with the integrated graphics unless you are not planning on ever doing some heavy duty gaming videos. Though, I've also heard if you get one of those processors that has it, and you have a dedicated GFX card, it can turn off the power to it when it is not being used and run off of the integrated chip to save energy and reduce heat - though this might be a motherboard feature; I'm not sure.
Make sure your case is large enough for all of your components and your PSU of choice. I didn't get the large case, and my PSU isn't modular, so cables everywhere.
Lastly, since it sounds like you will be running air-cooled, make sure you give your case proper ventilation. I run a 1st-gen i7 - runs at up to nearly 80C at the cores, underclocked. I don't know about the new chips, but I'm sure they run hot too, so be mindful. I've been told that 80C at the cores is barely acceptable, and 70C on the outside is the upper safe limit; an idle temperature of 40C-45C at the cores (30C on the outside) is what you want to get if the new chips are anything like the old ones.
Make sure your case is up off the ground and - ideally - not up against a wall internal to the house. Also, try to keep it as open to the air as possible with as little as possible surrounding it.
Good luck and game on/have fun!