@Hattig:
FPGAs with integrated PowerPC core are
very expensive. Besides existing baseline Xilinx Spartan-3 are cheap and can execute most tasks needed by an Amiga. No PowerPC in Spartan-3 asfaik.
Cheapest Virtex-4 is 210 USD, no Virtex-4 FX (PowerPC) found.
Virtex-II Pro might be the answer. It costs 126 USD. But it's in 456-FBGA package (and all Virtex-II are in BGA pkg):
http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=122-1451-ND
