I've always liked all-in-one solutions that make so-called "simple" upgrades painless.
My list would include either a box for putting a PC power supply onto a 1200 with no soldering, or maybe a custom 100-150 watt supply that is a direct replacement for the crummy 1200 power supply. Discount deals with PPC accelerators would be sweet.

A simple, compact box that houses a laptop CD-ROM or DVD, that plugs into a 1200. I've taken my machine apart many times, but would never make it into a tower!
And of course...
A cheaper way of reading Amiga floppies on a PC. I have to believe there's a better way to make a hardware emulator with a PCI card and, say, an EC68020, to read ONLY Amiga floppies, instead of spending almost $100 for a Flipper card that uses a custom IC to read hundreds of floppy formats. Is an custom IC even needed to drive an Amiga floppy, or can it be done with Radio Shack parts? :-D
Or maybe what we need is a 1.4 meg floppy drive for the Amiga... *anything* to transfer files from an Amiga to WinUAE that doesn't involve a null modem cable!
-- Wac, who is now, finally, running Linux!