Need help choosing a build

i have two different builds an AMD build and an Intel build.

Intel
Case
Mobo
Video Card
RAM
HD
CPU
PSU

the next build is all the same except for cpu, mobo, ram

AMD
Mobo
CPU
RAM

This build is mainly for gaming.
My monitor is 1680x1050
I will also hook up my 32 inch TV to my computer, but i wont game on it, if i did i would play only RTS's or MMORPGs
I'm wanting to add liquid cooling as well only for the CPU for now to keep the price down.

My budget for the pc is about $850 not including the liquid cooling.

i know the AMD build is more futur proof than the intel, reason why im kinda leaning towards that, but if the intel build is better i might go with that.
is ddr3 ram really any much better than the ddr2 800? would i notice a big difference or none really?

would i really ever need two 4870's? i mean i know i would if i decided to go with a bigger monitor, but would i notice any performance gain on a 22inch with two of those cards?

also what would be a good liquid cooling system for my CPU? i was looking at swiftech and saw a kit for $159.99 but can i get just as good by buying the parts separate?

You might not need 2 4870s for that resolution...
And for that resolution, going with 2x 4870s is not at all required...

And are you gonna overclock ?

If you are spending $850 for the PC core components alone, then I would suggest this config...

CPU + Mobo
X4 955 + ASUS M4A78T-E AM3
http://www.newegg.com/Product/Comb [...] mbo.212580

RAM - Same GSKillz Trident

HDD - Same WD Black

Graphics card - XFX HD 4890
http://www.newegg.com/Product/Prod [...] 6814150359

CASE -
CM Storm Sniper
http://www.newegg.com/Product/Prod [...] 6811119196
or
CM 690
http://www.newegg.com/Product/Prod [...] 6811119137

PSU - Same Antec

Total - $855

And it has a very powerful Quad core CPU + a very powerful graphics card, that can even run 1920X1200 resolution monitors well...

^ you can get the NV edition of it if you want a window.

for liquid cooling, the corsair H50 looks the best bet if it's just the CPU you're liquid cooling. if you want to cool the GPU aswell then you'll want a custom loop.