depends what you want to do.
you can try to max it out with PCI slots and the like, but if you want retro gaming nailed, then as previously suggested, forget bulky towering and trying to compete with PC's and just go for what its good at.
.base A1200
.030 accelerator with a decent amount of ram (16Mb plus) that doesn't block the pcmcia port
.pcmcia ethernet or compactflash card adapter to transfer data
.compactflash+ide adapter as hard disk
.registered WHDLoad package and games
.3.1roms? meh. either or on this one
for extra you may consider each of the following...
.indivision scan doubler for vga output of all amiga screen modes to flatscreen TV or monitor
.040/060/PPC accelerator
.PC tower rehousing
.mediator to botch PCI onto the A1200 for GFX/sound/ethernet/TV/USB card
.pc keyboard adapter
.ide port accelerator
.ide dvd/cdrw
.clock port USB
depends what you want to do. after faffing about with PPC accelerators, and graphics cards etc, and got a blown ide fix-express and nano-itx psu. i just want a machine that works, and plays games. to be honest, my A500 has been getting switched on more than most recently. :-)
i think the main thing, is, how deep is your love/wallet? :-D
