Lots of ?'s! Getting a new Comp

[Mr.Suave]

hi all,
im new and looking to get a new gaming comp becuase im giving this laptop to my bro. Ive looked at the big companies like Dell and Alienware but they're too expensive.
I found ibuypower.com and might get this:
-Raidmax A8 Aluminum 8-Bays Super Light Weight Case
-500 Watt Power Supply
-[939-pin] AMD® Athlon-64 X2 4800+ CPU w/ HT tech.
-CoolerMaster Liquid Cooling Fan System Kit+2 EXTRA CASE FANS
-Motherboard:eVGA 133-K8-NF41 nForce-4 SLI Chipset Dual DDR w/7.1 Sound, Gb LAN, S-ATA Raid, USB 2.0, IEEE 1394, Dual PCI-E MB
-1024MB X2 MB DDR-400 PC3200 Memory Module
-[PCI-Express 16x] Nvidia Geforce 7800GTX 256mb w/DVI+TVout video
-[S-ATA150] Maxtor 300 GB 7200 RPM 16MB Cache Hard Drive
-CD-RW/DVD-RW Drive and DVD Drive
-ViewSonic 17" VA712B TFT LCD Monitor
All for ~$2,900.00 that includes XP/Office and things like lights & keyboard.
Ill be using this computer for mainly gaming and a little bit of word and internet surfing for school.
Should i get this? Wat should i add or take away?
and....
Would it be better to get 2x 160gb hardrives w/ raid 0 and/or 2x [PCI-Express 16x] Nvidia Geforce 7800GT 256mb w/DVI+TVout video?
Could i use my reinstall disk to put in Microsoft Office and XP home edition or would i have to buy it with it already installed?
Any other websites you guys know of that are cheaper?
I dont want to build my own right now, although i kno its cheaper,i just dont have the know how or the time.but i will build one someday...

Thanks a ton in advance!

 

[MatrixEVO]

Would it be better to get 2x 160gb hardrives w/ raid 0 and/or 2x [PCI-Express 16x] Nvidia Geforce 7800GT 256mb w/DVI+TVout video?

The two 7800 GTs would be the best choice instead of 2 160gb HDDs in RAID configuaration.

Could i use my reinstall disk to put in Microsoft Office and XP home edition or would i have to buy it with it already installed?

I have never used OS reintallation discs, just the full version installs. What brand computer did the reintallation disc come with? Becuase it may only be able to be used on that type of system, unlike the full version which can be used on any system.

 

[Mr.Suave]

I have never used OS reintallation discs, just the full version installs. What brand computer did the reintallation disc come with? Becuase it may only be able to be used on that type of system, unlike the full version which can be used on any system.

I got it with when i got this laptop from Dell.

 

[MatrixEVO]

Then it probably will not work with the new computer you buy. So you should either buy the computer with it, or purchase it separately.