OK here goes:
A500 - 1.2 rom, 1MB
A500 - 1.3 rom, 1MB
A500 - 1.3 rom, 1MB chip, 2MB fast, 40MB HDD.
A600 - 2MB Chip, 4MB Fast, 3.1 rom, 6GB HDD.
A1200 - Blizzard 1230MKIV with 32MB ram and FPU, 3.1 rom, 40GB HDD, buffered IDE, internal laptop DVD-RW.
A1200 - standard setup with 4MB ram expansion and internal 3.5" HDD.
A4000 - 040 with 18MB ram, SCSI card, 60GB IDE HDD and CDRW.
Gameboy B/W (with flash cart)
GBA (with flash cart)
N64 x3 (plus Z64 Mr. Backup)(sold my CD64Plus late last year)
PS2 Slim (chipped)
Xbox x2 (1 soft modded)
PSP phat (UP chip)
And finally planning on getting both a 360 and PS3 this year, and wife is planning on getting a Wii (which I will softmod
Main system - Q6600, ATI Radeon HD 4870 1GB, 8GB Ram, 2.62TB HDDs, DVD-RW, Thermaltake Tsunami case, Thermaltake 750W PSU.
Emulation system - Athlon 64 4000+, 7800GT 256MB, 3GB Ram, 3.12TB HDDs, DVD-RW x2, Thermaltake Soprano case, Thermaltake TR2 500W PSU.
MAME Cabinet - Athlon XP 3000+, ATI Radeon 9800 Pro 128MB, 1GB Ram, 1.2TB HDDs, DVD-RW
Download server - Athlon XP 3000+, ATI Radeon 9800 Pro 128MB, 1GB Ram, 560GB HDDs, DVD-RW
Linux test server - Ubuntu/Fedora, 9800 Pro, Athlon XP 3000+, 1GB Ram, 60GB HDD, DVD-RW
NAS - Buffalo Linkstation 500GB
Spare PC - Athlon XP 2000+, 1GB Ram, 260GB HDDs, DVD-RW
Win98 (DOSBox) PC - Pentium 2 450MHz, 512MB Ram, TNT2 graphics card, Voodoo 2 12MB, Soundblaster Gold.
Just got hold of an Atari 520STFM. I used to own one since 1987, but that eventually died when the PSU blew and it was sold for spares on ebay.
I also decided not to bother collecting 8-bit systems as the emulation is so good these days.