First off, I'd tell you to pretty much scrap everything you've been thinking so far
. Second, you didn't give a budget but by the parts you've chosen, I'll assume that it's pretty high.
get an E6700 unless you feel generous enough to be giving free money to big corporations, in this case Intel. The E6700 will not give you any extra performance at all then the E6600 after overclocking. Save the $200 ($300 if you wait a couple weeks.)
That graphics card is a very weak choice. You can get much more performance for $160 but that's irrelevant since you will want something much more powerful. That card won't even max out Doom 3 let alone any newer games.
You don't really need a raptor for your hard drive. It's a waste of money really, especially for such a large one. If you really want a raptor, just get a 36 or 74GB one and get a big 7200.10 Seagate Barracuda. The speed difference is really negligible. And if you RAID0 two Barracudas, you'll even get faster speeds then a raptor while having a huge amount of storage.
Anyways.... Here are my suggestions:
CPU: There really is no other choice unless you want to save money or pay $1000 for a quad core but that is only for people who really like to waste money. E6600
Mobo: Lots of choices here. Either of these will overclock very well and all of them are pretty popular. Just depends on how much you want to spend really and if you want SLI or not. Gigabyte DS3 $120, Asus P5B Deluxe $180, Intel Bad Axe 2 $200 or so, eVGA 680 SLI $210 or so.
CPU Cooling Fan: The Tuniq Tower ($~60) is one of the best HSFs on the market.
Case: Personal preference and how much you want to spend are the biggest factors here but here are some that I like for what I would assume your budget is: Gigabyte 3D Aurora Original($130)/570($160), CoolerMaster Stacker 832 (the mother of all cases pretty much) $250, Antec P180 ($120), Antec 900 ($100), pretty much any Lian-Li etc..
Video card: The best you can get right now is the 8800GTX
, about $550. If you don't want to pay that much, you can get the 8800GTS640MB
for $340 or 8800GTS320MB
for $260. I wouldn't go anything below that unless your budget is a lot lower then I assumed. Note that the new ATI cards should be releasing sometime in May as are new offering from nVidia.
Sound Card: X-Fi XtremeGamer
. $50 right now from Newegg. Very good card for the price and a great deal for $50.
Power Supply: My favorite is the Corsair 620W
which is about $150 from Newegg, $120 from ZipZoomFly. Will power anything pretty much even 8800GTX's in SLI if you really wanted to.
Hard Drive: Like I said, I don't think Raptors are worth it. I would just get Seagate Barracudas and if you want some more speed, buy two of them and put them in RAID0 (although if you have some really important files back them up as RAID0 doubles chance of data loss although you should be backing up important files anyway)
RAM: G.Skill 2GB (1gbx2) DDR2-800 HZ
model. They are the black ones for about $180-190 from newegg. AMAZING RAM. These used to cost quite a bit more just recently.
OS: Why XP Home? No one gets Home nowadays. Get XP Pro if you don't want Vista.
CD/DVD: Not of much importance.. Any will do pretty much..
These parts will serve your purpose and much more.. Sorry no links.. Would've taken too long. If you can't find something, just let me know. All of these parts are available on Newegg.
Just my opinion..