well same I were to buy one just cuz I kinda need a computer which one should I buy, i was leaning more to option 4, and then possibly in the future upgrading the graphics card, does it make any sense to do that? What other upgrades would eventually need to be made? Thanks a lot for your help I'm completely lost but your help is awesome.

GtheB12

To turn Computer #4 into a decent gaming machine, you want to spend about $250 to get a quality PSU and a good graphics card. I know the 7900GS in my area (sacramento, CA) is on sale for $100.  

Ok, do you have your ASUS motherboard manual?

That's the first place you should look. 

The only thing I can say is that you will definitely need a DX10 GPU if you want to run Hellgate: London. You might want to think of having another company prebuild your computer and ship it to you, like Dell, or Cyberpower.

But to answer your question, computers 1, 3, and 4 are the most powerful, but if you want to install a video card, you're going to need a new PSU as well. 

I don't want to go into specifics but there are different ways. Try googling it, or going to the Overclocking Union. Anyway, the Cooler Master Liquid Cooling system is alright. I'm guessing it's the Aquagate model? Anyway, you can probably take it to 2.4, 2.6 pretty easily. And don't worry, your CPU is probably one of the higher end models in the Socket 939 line.

BTW, I would change your sig to say Corsair instead of ...w/e you wrote. 

Well, your motherboard manual should explicitly state in the BIOS section which key to press.

and np.