This will be my first system build, I think I have everything I will need for it, tell me what you think. The mobo, memory, and cpu COULD possibly change if something in the next few months comes out thats better, But for now this is it.  
 
Coolermaster Stacker 832
Coolermaster Power Supply 850 Watt
EVGA 780i Mobo
Q6600
4gb Corsair Dominator 1066
Zalman CNPS 9700 CPU Cooler
(6) 120mm fans
I already have (2) New EVGA 8800GT SC to run in SLI
I will be installing Windows XP SP2 Media Center 2005
Brand New Gateway 24" FHD2400 Monitor (Just bought this)
Well what do you think? Am I missing anything? See any issues wit this setup? PLEASE give me some feedback. Thank You.

See nothing wrong here, except for HDD The other issue is the OS, well I assume you already had it from your previous system, it's OK then.
 
This is current top notch I must say ...

Oh yeah I already have  (2) 80GB Raptors, and a 750Gb, and yes OC XPSP2 is from my Dell xps 600. Thanks for looking at my build.

The OS from the Dell may not work on anything else.

Yep, hard disk & optical drive.
 
IF the OS is from Dell, don't pull things out of the old pc yet. Format drive and do a fresh install. Upon the setup finishing copying files to hard disk, it will restart the pc. Shut it down instead. Put this hdd in the new pc & the same OS cd.

Ok, will do, thanks for that. Why wouldn't the OS from the dell work in another pc? Is it something the disk see's in the bios or something, that recognizes that it's a dell?

Wont work since you will need to activate the XP coppy.

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My 1st PC(2003) OCed/Built
E2180 @3.2Ghz + P35DS3L +8400GS (700/475 OC)  

Yes, exactly...it will look for the BIOS.
It may not even be a Windows installation disk. Many of the OS disks that come with prebuilds (like Dell) are not really true Windows install discs, they are "restore" disks. They simply mirror a new image of the OS and all the driver/settings back to your harddrive so your PC is again like the day you bought it.
Something you will need to look into a little deeper and determine for sure what you have.

i'm guessing if you have the cash for that, you can afford a copy of Vista Home Premium?

To be honest, I do not want to use Vista at all. If the dell cd won't work than I geuss I will just have to buy a copy of XP. Thanks for the feedback.

Shadow703793, damn, that escaped me. There are workarounds for activation. I'm not encouraging it. Quite a number of legit users would rather work around activation than deal with the hassle.
 
bryan240g, the best time to buy an OS is when you buy a cpu/mobo combo. Or a brand new pc. Any other time, the price will be higher. Look at OEM XP prices at newegg.