Help With Choosing Components for a Custom Pre-Built System

I'm thinking of ordering a pre-built system from AVA Direct in the next few weeks. Having some trouble figuring out the features/benefits between the various 1TB drives and some other components. I plan to use the system primarily for:

1) Occasional Gaming (SC2)
2) Photoshop (hobby photographer, not pro)
3) Video editing (hobby)
4) Streaming movies to a PS3
5) Possibly recording video via TV Tuner

I don't plan to overclock and would like to buy a system that's fairly "future proof" in case I get into games that require more oomph than SC2 or 3D games. Looking to spend around $1700.

So far, I've been focusing on the following components:
1) Case: COMPUCASE HEC 6C28b
2) Power supply: Antec Truepower T750
3) MB: ASUS P6T X58
4) CPU: Intel I7-930
5) RAM: Corsair 6B XMS3 PC13-12800 1600MHZ CL7 (7-8-7-20)
6) GPU: 2 Sapphire Radeon 5830s 1gb (crossfire)
7) HD: 1TB Westernal Digital. Can't tell the benefits between the following models (all 7200rpm):
a- Caviar Green WD10EARS 3GB/s 64MB Cache
b- Caviar Blue WD10EALS 3GB/s 32MB Cache
c- Caviar Black WD100FALS 3GB/s 32MB Cache
d- Caviar Black WD1002FAES 6GB/s 64MB Cache
8) Sound: Creative X-Fi Xtreme 7.1

I'm fairly set on the CPU, GPU & RAM components, but could use suggestions on the Case, power supply, MB & HD.

Thanks for your help!

Dont get a crossfire setup from the start, it keeps you from doing a cheaper upgrade in the future. I would suggest a single 5850 or 5870 for now, keep the TP-750. When you need better performance in games you can just add in a second one.

Do they offer the samsung F3 1TB hard drive? Its faster in sequential read/writes than most other drives out there.

Why are you getting a sound card? Modern onboard sound is more than adequate for most peoples needs, unless you have high quality speakers you wont get any difference between onboard and discrete sound.

Flinron- you can save a considerable amount of money on the build by building it yourself. We can help you pick out the exact parts you'd need, and there are plenty of guides on how to put the computer together (it's really not hard, you pretty much just have to plug stuff in to the right spot- be sure you're static free )

Otherwise, i agree with Hunter. You don't need a sound card, and stick with the F3. Also, you're better off going with one 5870 (or even a 5970) instead of 2 5830s.

That build is (eh) at best, usually these companies throw in seemingly-random parts that won't perform nearly as well as a custom built computer for the same price.

Thanks Omniblivion. I've considered building my own, but I don't think I have the temperment for it. Besides, I just priced the components above (after ditching the sound card and adding the Samsung F3 HD) and it comes out to about $1450. The AVA Direct quote is $1600. I'm willing to chuck in the extra $150 for them to do the work.

One other question now that you guys have suggested the Radeon 5870:

Are there substantial differences between the various brands of radeon 5870s? AVA offers the following:
1. Gigabyte GV-R587UD-1GD 850Mhz - 1GB
2. Gigabyte GV-R587OC-1GD 870Mhz - 1GB
3. Gigabyte GV-R587SO-1GD 900Mhz - 1GB
4. Microstar R5870 900Mhz -1GB
5. XFX 850Mhz - 1GB

Also - is there a benefit to getting a network card vs using the onboard controller?

Here's my concern around getting a Radeon 5870 out of the gate, rather than 2 crossfire 5830s. From what I've read, 2 5830s will outperform one 5870. If I go with the 5870, and decide to upgrade 3-5 years from now, will the 5870s still be around in order for me to get a 2nd one?

If not, I'd be forced to buy 2 new GPUs at that time anyway. So why not go with 2 5830s now for the performance boost?