Buildin a system, does it look good?(Questions too)

Hey guys im building a hardcore gaming computer, and i'd like to know what you think about it.

The titles of parts marked in red means i have a question thx

From the ground up...

Case
XION II XON-101
Linkage

Power Supply
600W Modular PS (Active PFC, Dual +12, SLi Certified)
Linkage

Mother Board
ASUS A8N32-SLI Deluxe [Socket 939, nForce4]
Linkage

CPU
Now here comes a question... I'm having trouble deciding between the following two CPUs..
*FX-57 [San Diego, 2.8GHz]
Linkage

ooor..

*X2 4800+ [Toledo,2.4GHz]
Linkage

I know normally more GHz is better... but im not sure between two different types of CPUs. Can someone tell me which would be better for intensive gaming?

-----Heatsink/Fan
--------Zalman CNPS99500 HSF (Using Arctic Silver 5)
--------Linkage

RAM
OCZ Platinum Series 2GB(2x1GB) DDR400 PC3200
Linkage

Hard Drive(s)
2x Maxtor 250GB 7200RPM SATA II (3gb/s)
Linkage

Video Card
nVidia 7900GT 256MB GDDR3 PCI-E (I mite do SLi Maybe)
Linkage

Is this the best card i could get nvidia-wise? Is there a better one you would reccomend that is in the same price range?

Sound Card
X-Fi Platinum (w/ front panel)
Linkage

Peripheral Devices
DVD +/- R/RW + DL
Linkage

Other Stuff
5.1 Speakers
Illuminated Keyboard
Logitec MX518 Optical Mouse

If there is anything you like/dislike or want to warn me about.. or whatever.. let me know! Thanks Guys.

 

Bump..