Just gonna go out on a limb here and say "Wow, there's no way any MMORPG that you'll play is going to need that kind of power."
I think most $700 laptops will play Warhammer Online, and the EEEPC is capable of playing WOW.
So, this machine clearly is not for playing MMOs; otherwise, you'd have a low end quad core like a Q9300, a P45 (or P43, or P35 or P31) chipset-based motherboard, and just about any graphics card from the $80 HD4670 on up.
RAM, I won't knock you on, or on hard drives, or on cases, etc...but your power supply is also vastly overkill.
A good 750W PSU would work for your current config just fine, and would have half the cost.
If you tell me you're leaving room to run two HD4870X2s...you're beyond saving.
I know I am mainly playing MORPGs, but I do still play some FPSs, and yes, I am not adverse to spending some money, but at the same time, I don't want to waste money either. I am going 4870, but, since I haven't had a new system for almost 2 years, I haven't kept up with everything.
Quadfire sounds very interesting, is there a huge difference and does the software/games take advantage of it?
When you say "I am going 4870", do you mean that SAPPHIRE Radeon HD 4870 X2 2GB in your first post? It's the best video card you can buy these days and a perfect match for your 24" 1920x1200 LCD.
If you get the HX1000 PSU you'll be able to add a second one, but before you do I suggest you check benchmarks for the games you'll be playing at that time. Then you can decide if it's worth it or not. Right now, adding a second HD 4870 X2 for $530 is not really worth it IMO. On the other hand, a year from now, if the card price drops to only $300 or whatever, and games are more demanding than today, and ATI drivers support QuadFire better than today, it could be an excellent idea.
Hold your "manning up" till nehalem is out. Get a 920 i7 cpu and a x58 motherboard. Its like gonna be released in just a couple days now... Otherwise, you will be kicking yourself for being impatient. We are talking like 3 days here. Surely you can wait 3 days.....
Warhammer online isnt very demanding on your CPU or GPU.