I have been spending a lot of time looking through boutique builders, and get apprehensive just shy of pulling the trigger. I always hop onto NewEgg and 'build' the same system to find that I am spending $500 - $1000 more than building it myself. [/what everyone already knows]
Here is what I am thinking:
Usage: FPS gaming at 1920x1080 (need a new monitor as well)
CPU will be clocked to a minimum of 3.8Ghz
Still trying to decide on 5870 or GTX 480. Will likely get a second card in future.
Heart isn't absolutely set on the Obsidian 800D, but lots of good reviews.
Plan to liquid cool within a year.
Newegg Total With Shipping: $2007.79 ($1977.79 after Mail in Rebates)
I would go with a HD5870, and then crossfire down the road, as it stands now, ATI has nVidia beat on the performance to value ratio. Also, the new fermi chips get really hot and use a lot of power.
Upgrade to the i7-930, its the new standard
The Hydro H50 is kind of risky because budget watercooling is asking for problems. I would recommend the CoolerMaster Hyper 212+ until you upgrade to real water cooling. It has been reviewed very well and is very popular.
I think G.Skill RAM is going to be a little cheaper, the dominators really aren't worth the added price.
Make sure the SSD you get is the second generation (G2)
You will probably need a storage drive, I would suggest the Samsung Spinpoint F3 500GB/1TB HDD.
Thats a great PSU, but a little overkill, you would be set with the 850TX.
nVidia vs ATI:
I see the same Pro vs. Con on these. 480 is faster then 5870, slower then 5970.
1.5 GB on 480 vs 1.0GB on reference 5870 but doesn't make a difference.
5870 runs cooler, draws MUCH less power at idle.
480 has CUDA and PhysX though, which lean me their way.
Charts also show 480 scales better in SLI then 5870 in XFire.
Am I missing anything here? If the 5870 is the better choice... I will go that route.
Can the H50 support a 3.8Ghz overclock on an i7?
The Ram comes in a combo with the CPU [$280+$270=$550 -$35=$515]. So the combo essentially makes the ram cost $235. Lowest priced 3x2 [6GB] ram I can find is $170. Link to better ram option?
Thank you for noting the second Gen Intel, I was reading up on the differences last week. I actually have an old 74gb Raptor that will be my storage drive. All that I do is play 1 or 2 games, surf the net.
What would be required as far as power supply to do dual 870s? Dual 480s?
 You mention that you'll be gaming at 1920 X 1080. Now a 5870 is more than able to play any game maxed out at that resolution (maybe except metro 2033, which is just poorly coded & buggy anyway). In fact, if you add a second 5870 down the road, the combination of both would be absolute overkill for 1920 X 1080. In that case, you could consider eyefinity & add a couple of more monitors. Or you could get a single 30" 2560 X 1650 display.
In conclusion: you don't need the hotter & power hungry gtx 480 for gaming at 1920 X 1080, where a single 5870 would be adequate. Even if you add more monitors or upgrade to a higher resolution display, adding a second (even third) 5870 would do the job.
 With regards to CUDA & PhysX, how many of the games out there really take advantage of that? That's just an Nvidia gimmick.
1. Liquid cooling doesn't compare to big air until ~$500 worth of parts.
2. Pre-packaged kits like the H50 are louder, and worse performing than good air.
3. PhysX is basically dead. CUDA has nothing to do with gaming... it's for massive parallel computing, especially benefiting floating point calculations.
4. Raptors are equaled in performance by the Samsung spinpoint F3's which are are fraction of the price for much more space.
5. Case is your choice, but honestly, I've never spend more than $150 for one. A HAF 922 is really a the top deal ATM.
The only reason I don't really recommend is that the 5970 will be all you'll need at 1920x1080 until next gen consoles come out, 2014 earliest. As a result, don't really need the 1366 platform. However, if you ever wanna eyefinity, then you'll need to got he 1366 route, as 1156 can't really use more than the 5970.