I have a Macintosh Macbook Pro 17" laptop computer. Soon, I will download Windows XP onto it. That is all. I don't know its stats because I have never bothered to look into it. All I know is that it kicks ass.

AMD 939 X2 3800+
4x512mb PC3200 (2gb total)
Asus A8R-MVP (older ATI Crossfire motherboard)
ATI X1600XT 256mb PCI-E w/ Rosewill 19" LCD
Seagate 500gb Sata Hdd
Lite-On DVD-RW (w/Lightscribe)
Sound Blaster Audigy1 w/Logitech Z640 5.1
Logitech Keyboard & Mouse ;)

XPw/SP2

I've got Oblivion so heavily modded that it runs poor but destroys the visuals on the PS3/360 versions. :)

Processor: Core 2 Quad Q6600
Graphics Card: Asus 8800 GTS 640MB
Memory: 2 GB SLI Ready Ram 1066Mhz
Motherboard: P5n32 E-Sli 680i chipset
Operating System: Windows XP SP2
Case: Antec nine-hundred
Monitor: Samsung Syncmaster 931bw widescreen X2
HDD: 500GB SATA X2

Processor: t2400 1.83 ghz duo
Graphics Card: ATI x1400 256mb
Memory: 1 gb
Motherboard:?
Operating System: XP MCE
7200 rpm hard drive

Not bad for a laptop.

Processor: Core 2 Extreme Quad QX6700
Graphics Card: Sli Nvidia 8800 GTX (one overclocked)
Memory: 4 gb ddr2 800
Motherboard: nForce 680i SLI 775 Black Pearl 
Operating System: Windows Vista Ultimate
hard drive 300 gb at 10000 rpm and 750 gb at 7200 rpm

Water Cooling

Cost $ 7000

 maaan nice rig. It's like better than mine in almost every way haha. I got an awsome oc with my gts tho :D I don't regret buying it instead of GTX.

Just for kicks, I'll post my family's first computer when I was young (given to us by our church when they upgraded to 286s):

Processor: IBM 8088 running at 4.77MHz
Graphics card: Ha!
Memory: 640K TOTAL!
Motherboard: IBM Compatible 8-bit motherboard
Operating System: MS-Dos 3.0
Hard Drive: 32MB 700RPM Drive (and it was HUGE)
External Drive: 5.25" Floppy
Modem:4800 Baud Modem
Sound card: Beep
Monitor: 12" Orange Monochrome CRT

Cost:Free!

We've come a long way...

 Commodore 64 was our first =)  If you really can call it a PC.  

We used to have a ton of games too...Minnesota Fats is the only one I can remember now though.  I would have to dig around and see if we still have them to remember the rest. 

Did you buy this from Alienware? Geez, talk about highway robbery ...

CPU: AMD X2 +4200
Graphics: on board (waiting a bit more to get a good price on 8800)
Memory: 2G DDR2-800
MB: Asus M2N or something
OS: Win XP

CPU + Memory + MB + PSU ~= $300 CND
It's half assed upgrade :)
Planned to wait until I move before getting new new monitor along with a decent graphics card.

BTW, my sis' computer crapped out. And what crapped out? The PSU of course. It was a generic PSU. I bought my PSU separate then, before her computer. Upgraded mine and gave her my old PSU and it still works wonderfully. (That thing cost 3x more than the case I still have, lol)
So, yeah, don't gimp on PSU :)