Hmm, lets see, let me make some tall orders.
First and foremost. More people in the U.S. that can do hardware repairs and upgrades on Amigas. I still have not gotten the IDE adapter I ordered working, and now my kickstart socket it damaged, Hurray!
Hardware:
An IDE adaptor for the A1200 and or A600 that installs with ease and does not try to share space with other upgrades.
A GFX card for the A600 or A1200.
Amiga on a PCI card (FPGA?) for use with MorphOS, OS4, and AROS machines with PCI slots. The idea behind this would be to call upon the hardware directly to launch apps and games that require the original Amiga chip set(s).
MIDI Adapter with more inputs and outputs than offered before.
Software:
Well this isn't Amiga specific, but I'd love to see something for MorphOS that both Amithlon and OS4 users get to enjoy...
...a program to redirect all calls to the Paula chip to AHI instead. I'd pay for that!

A modern game construction kit?
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I don't know what to ask for, but these would help!