Gaming PC experts needed.

[ACE]

Go to ibuypower.com and build your own thats what I did got my Liquid cooled one for $1000

[curry1]

Newegg.com

If you can't build a PC, that's the best place for a cheap, decent gaming rig. If you CAN build, buy your parts from there and build it together, you'll usually save between $100-200.

3 important things for a gaming PC.

Proccessor (CPU)
Graphics Card (GPU)
RAM (Memory)

But you'll also need a good power supply to run it all, 800W is pretty decent.

Intel i7 is one of the best CPUs.
GPUs- you can either go Radeon or nVidia. Both are pretty nice, I myself use Radeon. If you play only those two games, then a Radeon 5770/nVidia GTX260 is plenty good enough to max it. If you play more demanding games, then a Radeon 69xx/GTX460 should be able to run pretty much every game out there.
4GB of RAM is all you need, anything over 6GB is overkill. I know guys with 12GB and it scares me.

If you play a lot of games/make videos/take pictures, then a hard drive is 1TB is plenty of space, and you can always add more if needed, so no big deal here.

Sound cards - an onboard card is fine IMO, usually adding a sound card adds more trouble with drivers and conflicting programs, at least for me anyway.

Motherboard - you should try to get one with at least 2x PCI-E slots for any future upgrades.

Windows 7 Home 64bit is good enough, no need to buy that proffessional stuff. 

A single 5770 runs Wot great as that is what is on my rig.  I also can play battlefield 3 beta on max too.  I also have an i7.

[tassos]

Avoid PCs cause:

-first of all to much watts (PC about 400-600 watts,Notebook 80 watts)
-you cant take it with you

I use most time since 1 year a 8GB ram 18,6 inch 650GB HD,2GB vram ATI ,Fps is stable 60 and I use headset
when I travel the Notebook is always with me,only when Iam on Vacation i don't touch computers
I play sadly with slow and always crashing Win 7 ,and work ore surf with fast and save Ubuntu 11,04 Linux 

Packard Bell
EasyNote LM cost 2010 about 800 euro

[titanic3]

Notebooks are NOT designed for gaming...at ALL. The same price that you might get for a decent notebook, you can get a fantastic PC. 800Euros is about $1000, for which you can build an above average PC. Notebooks/laptops get outdated and you'll have to buy a new one if you want to keep up with newer games, in a PC, you can always upgrade buying only the necessary parts.

PC might have PSUs of upward to 800-1000W, but that doesn't mean they use that much all the time, only when you decide to play 5 games at the same time in windowed mode is that ever the problem. IF you can even get 5 games to run on windowed mode at the same time running.