ok, let's see:
A good sturdy tower, hand-crafted to fit the A1200 and its gadgets
A1200 mobbo with all the required fixes
custom-burned 3.1 kickstart roms to include as many fixes and speedups possible
BPPC 060@80 , 603e@300 (not overclocked, replaced cpu) , scsi , 256MB 50 ns RAM
BVision PPC
Mediator TX with Voodoo 3 3000 16mb, TV tuner, Fast Ethernet, Radeon 9200 128mb, Spider USB, Soundblaster 5.1
Quaddraport with Subway USB, Delfina lite, fast parallel and fast serial port
Indivision AGA
Fastata MK 3
Lyra keyboard adapter
MAS MP3 player
A Wacom penpartner gfx tablet
Coccolino mouse adapter
Wifi PCMCIA card
2 playstation to amiga adapters
mouse/joystick switch
a good digital monitor switch for voodoo/radeon/bvision/aga
A good 300W ATX PSU
A couple of fans blowing in and out of the tower to prevent everything from melting down

ps
It's not that I have all these (in fact, many of these I do), but I wish I had!