Most bang for 600 USD?

[amiman99]

You can probably build brand new Amiga 1000s  for $600 in material costs in China easy BUT who is going to pay the millions in R&D to recreate a 100% compatible Amiga 1000 motherboard and do all the testing?

Manufacturing costs per unit are not the issue, it's finding a genius to create something fantastic and revolutionary from the ground up that is difficult, R&D and upfront investment is why it doesn't happen on a regular basis. Even Macs are just regular PCs in different cases.

The improved A1000 MB is already done, just needs production.
http://www.illuwatar.se/project_pages/gba1000/gba1000.htm