I like both FPGA Arcade and Natami, although my vote goes to Natami.
Arcade will be like a 1200 add on the daughter board and you have a 060' + USB + ethernet.
The only problem with Natami is the progress and progress information

Natami will be much more improved amiga and has room for 2 expansions (PCI + CPU board). The CPU expansion
could also have a modern PPC accelerator (3rd party), 10/100/1000 Ethernet, USB2.0, DDR2 Memory (with 64bit bus), AGA (100 times faster), Native 3D core, N050 softcore hybrid 68k with 68000, 68060 and Coldfire instructions (the first N68050 release scores are comparable to a 500 MHz Motorola 68030).
http://www.ppa.pl/artykul-12.questions.to..Natami.Team.part.1-3_32_1334.html (interesting interview)