Q9450
TRUE (with a good fan like scythe s-flex, noctua or yate loon)
Asus Maximus Formula/Gigabyte X38-DS4/Gigabyte X38-DQ6 (if he want eSata)
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131227
2x G.Skill Pc2-6400 2x2gb kit (you don't need faster RAM, total waste of money and barely provides any benefits at all)
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231122
2x Seagate 7200.11 500Gb in RAID OR 2x WD 6400aaks in RAID (the WD way is better)
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136218
Nvidia 9800GX2http://www.newegg.com/Product/Product.aspx?Item=N82E16814143128
Any decent dvd rw drive (your choice totally, i recommend the samsung ones)
Coolermaster Stacker (doesn't really matter which one you get as you won't be able to fit all the side fans with a TRUE anyway - those side fans are overkill anyway - i've got the stacker 831 with red mesh)
Corsair Hx620
Steelseries Ikari Laser/Razer Deathadder/Logitech G5 (i have the ikari :d)
Keyboard doesn't really matter, but the best choices are the saitek eclipse (first version is much better than 2nd, leds aren't bright enough on 2nd version) or the Logitech G15
For gaming a Samsung SM245B is good, or if you have money to spare the Dell 2407wfp/2408wfp are good monitors (however I have heard that they have a bit of an input lag issue, it's really response time for samsung, or better viewing angles with the dell)
For the sound card I'd say a Asus D2X or Auzentech X-fi (DO NOT GO CREATIVE, they've f'ed up all their drivers and don't really care about it either)
If you need speakers go for the z5500s, for headphones i'd recommend AD700s or HD555s
I've not checked if this is in budget, but if it isn't you can knock some off from the hard drives by going for one wd6400aaks, a p35 chipset mobo (like the asus p5k premium) and by using onboard sound instead of a sound card
Good luck on your build