The first computer I owned was a Commodore 64. Bought it for $5 from my old public school, which included the monitor, disk drive, and the C64 itself.
After that was a Pentium 386, pretty much stock. Then upgaded it to a 386DX after about a year of having it..
Got rid of the 386 and went with a 486.. Then the 486SX, then finally the 486DX running DOS/Windows 3.1.1
About a year before my parents split up, my dad purchased a PIII 450mhz/256mb/40gb/cd-rw system for this college course he took. So, my brother and I used this whenever he wasn't bogarting it to cheat on my mom.
After we moved out, I picked up a used PIII 450mhz/512mb/60gb/cd-rw at a pawn shop and used that for about a year, then upgraded to 1gb of ram and a PIII 666mhz chip
Once I turned... Uhh.. 17? My older bro got me a good deal on a P4 mobo/Celeron 2.4ghz/1gb ram, which I built using a 60gb hdd, cd-rw, and an ATI Rage 128 Pro
I used this PC for years, and continually upgraded it, which I then sold last year standing at a P4 dual-core 1.60ghz/1gb OCZ gaming ram/80gb SATA drive/Super Drive/eVGA 6800GT 256mb (o/c waaaay passed Ultra specs).
In college of 2005, I purchase my first Mac (mind you I've used them since teh 1st grade). It was a G4 TI Powerbook DVI, running 667mhz/40gb hdd/1gb RAM. I miss this thing, and my ex-gf kept it when I moved out of her dad's place. She also managed to drop it off my bed... Twice.. And it still worked.
Before I moved out from above, I bought a G4 iBook 14", 1.42ghz PPC/1.5gb RAM/60gb HDD/wifi/bluetooth/etc
Eventually sold that to my friend after I bought a 15" G4 Powerbook (1.33ghz PPC/2gb/60gb/cd-rw/wifi/bluetooth).
I actually just sold this one not even a year ago, in hoping to upgrade to one of the new Mac Mini's. However, that didn't go through as I had some financial troubles.
Currenly, I'm using an HP DV4000, 15" 1.70ghz/1gb/60gb/wifi/super drive, running WinXP Home. This computer is pretty good. It's solid, and I've had it for about a year and the only time I had to format it, was after I received it from a friend in a trade, so I could wipe her stuff off it. I traded a really nice skateboard for it, straight-up.
I'm currently trying to sell the HP so I can get some funds to move at the end of August.
To be honest, I use my 3G iPhone for most of my "computing" needs, like email/IM/the little web-browsing I do.
Once the HP is sold, my gf has offered to share her G4 Powerbook (same as one mentioned above), so I can use it for my audio engineering.
*wipes sweat off forehead*