I built my own. I have a PII-333, 10GB HD, 64MB RAM, 4XDVD, some kinda sound card w/ 8MB on it.
As for upgrades, I have always used the “only upgrade when the software I just bought won’t run without upgrading something” scheme. Since I built this system all I have had to do was add RAM and a new video card.
Mine is being built right now!
Intel 733MHz/133 FSB
128 MB PC-133
30.7 GB 7,200 RPM IDE Hard Drive
32 MB AGP VGA card
SoundBlaster LIVE!
Iomega ZIP drive
Samsung CD/CD-RW/DVD combo drive
I’m hoping to get many good years of service out of it 
My PC–>
Abit KT7-Raid Mobo (supports up to 8 IDE devices)
Athlon T-Bird 1.1GHz Processor
256MB of RAM
Soundblaster Live! X-Gamer (I had to get one kind of software bundle- might as well be games)
3DFX AGP Voodoo 3 card (with a squirrelcage slot fan next to the heatsink)
3-Com 3C900 Ethernet card hooked to a cable modem
ViewSonic A90 19" monitor
Altec Lansing ATP5 4 channel speakers with subwoofer
Boring case spraypainted with that fake granite paint
Slow 16x Creative Labs CD drive
4x2x2 CDR-W drive
30GB ATA-100 Maxtor HD
Trackman Marble cordless
A generic Ergonomic Keyboard with an unused trackpad.
New Fully Modded Case Coming Soon!
complete with window, neon, and blowholes!
Whooo!
The above is why I don’t have a new car. I currently make minor upgrades every 2-3 months and usually change the mobo and processor every 1-2 years.
My last upgrade was a month ago, and was about 650 - 750 dollars (new mobo, processor, 256MB ram, and a new case)
My current most decked out system (I have three others, but this is the system in my bedroom.)
-ASUS motherboard and P-III 750MHz.
-512M Ram PC-133
-GeForce2 Video Card
-SB live! Platinum
-52x CDRom
-6x DVD
-100Base-T Ethernet
-iiyama 19" monitor
-30Gig Onsite Echo tapedrive
-30G Western Digital HD
-20G Quantum HD
My current PC:
Intel PIII - 450MHz
320 MB RAM
Primary Drive Western Digital 30 G IDE
Secondary Drive is 10 G
All in wonder ATI 64 MB Graphic Card
3-Com 10/100 Ethernet card
Trinitron 17"
Boston Digital BA735 sorround sound speakers with subwoofer
12x DVD ROM
10x/4x/32x CD-R/RW
Internal 100MB Zip
all in a Full Tower,
I’m currently Building…
Apollo KT133A Via MoBo
AMD Athlon 1.1GHz TBird Processor
128 MB RAM
30 G Western Digital IDE Drive
… Still piecing together what I can… need a couple of cooling fans and a USB card…
Anyone know where I can get a decent KVM switchbox cheap? What’s good? I never actually used one…
I’m also equipped with one Apple PowerMac 8500/120MB RAM, 2 G Drive;
…and one Performa 6116CD 2 G Drive, 64 MB RAM.
Out of curiousity why a USB card? Your mobo should have at least 2 USB ports built in and a hub(s) will break those out to 4 or 7 etc as needed.
I’m planning on needing four. I’ve been having problems with USB hubs, slowing up the bootup on my current pc.
And I wanna try networking with USB also, just for kicks…