Going retro here. What computer systems have you owned in the past?

[SAT (aka GANDHI)]

My list is as follows:

Tandy Radio Shack Model III 48K RAM plus 2 Single Sided 5 1/4 disk drives!!! Paid $2,495.00!!!
Atari 800 XL 64K RAM plus the Atari 1050 Drive!!!! Paid $600.00
IBM PC - Yes the Original 4.77 Mhz with Dual Disk Drives and 256K of RAM and CGA Princeton color Monitor.  Paid $3,250.00!!!!
Amiga 1000 - 512MB Chip Ram and 512MB "Fast" Ram and Color Monitor Amiga 1080, Paid $1,495.00
Atari 1040ST - 1MB RAM with a SUPRA 20MB Hard drive and Color Monitor SC1224 paid $1495.00
Amiga 2500 with Video Toaster and Kitchen Sync 9 MB of RAM!!! 40MB SCSI HD!!!- paid $6,500.00
MacIntosh IISi (only because I had a Internet services company and had to tech support it) Paid $350.00 on a scratch and dent. 68030 based. with 40MB Drive and 1MB RAM.
From then on, it's been a series of clones and DIY PC compatibles.
Currently running a DIY job with a Dual Core Pentium D 830, 2 GB of Ram and 1.2Terabytes of drive space.  ATI X1600XT. Not the ultimate gamer's PC, but it works for my occassional gaming and general work.

[SAT (aka GANDHI)]

More like what HAVEN'T I owned...

TRS-80 CoCo 1, 2, and 3 - multiples of each over the years
TI-99/4a
Apple II+, IIe
Mac SE, Classic, Performa 5/75
Commodore VIC-20
Timex Sinclair ZX-81 and TS-1000
IBM PCjr (upgraded to 640k and a parallel printer port - best friend's dad used to work for IBM & I got it for employee pricing when they were dumping them CHEAP to employees)
Atari 400/800/800XL
And I've built countless PC clones over the years...

Today I have a bunch of these old systems for testbeds to use when testing ICs...
Commodore VIC-20 and 64
TRS-80 CoCo 1, 2, and 3
Apple II+, IIe, and IIc
TI-99/4a
Timex Sinclair 1000
Atari 400

Currently running a DIY P4 2.4GHz with 512Mb RAM that started out as an 8088 running at 10MHz years ago. It was upgraded over the years to DOS 6.22 and Windows 3.11 then to 95 then to 98 then to NT then to 2k... Hardware went from the 8088 to a 20MHz 286 to a 20MHz 386SX to a 486SX-25 then to 33 then to DX-33 then to a DX4/100 then to a 5X86-133 to a P75 to a P200 to a PII-233 to 400 to PIII-500 to 800 then to the P4 2.4GHz... When the move came from the PII-400 to the PIII-500 the PC finally lost the same 1.2Mb 5.25" floppy drive that was in it from the start.

RJ

[SAT (aka GANDHI)]

The First Computer I owned was an Atari 800 with a whopping  48K RAM and a Tape drive! I eventually got a Single side, Double Density 5.25 inch Floppy drive for it!
I spent a lot of hours programming BASIC on that computer, and Loved every minute of it!! 
I also owned an ATARI 800 XL
Commodore 64
My first PC was a 386 SX (16 MHz) with 1 Meg of RAM and a 40 MEG Hard drive! (After working with TRS-80's with just Floppy drives and 16 K of RAM, I thought a 40 MEG HD was Huge!)
After that I had multiple home built PC's over the years.
I also played around with Two Apple Power PC computers, just to see what all the hype about Apple was about. I personally did not see what the big deal was.
I am currently using Two Home built PC's. (The one that I am on now is about 6 years old (850 MHz AMD Athlon), and the other PC I am using is about three years old (1.8 GHz Athlon with 1 Gig of RAM). I also have the two networked together, along with a Network file server HD, and a Network Printer.
I haven't really seen a need for a faster/newer PC yet.  The Two I am using have been working just fine for all the software I use. 

[SAT (aka GANDHI)]

PDP 11
Microvax II (still operational)
CoCo
x386
x486
AMD P4
Celeron P5
P53.6g

[SAT (aka GANDHI)]

Commodore VIC-20
Commodore 64
Zenith (something with dual 5.25' floppy drives) paid 3k plus
Packerd Bell (can't recall model) 1.2GB HDD (thought I would never fill that up, then I went online... oops)
HP Pavillion (again cant recall model) 20GB HDD (filled that one too)
Dell Demensions 2350 (too many mods and upgrades to mention but it's time for a new one)