Honestly, if it's a faster Amiga blitter with more chip-RAM you're after, WinUAE is the way to go. If it's all that plus you want "the feel of hardware on real 68k processors" FPGA-Arcade is the way to go. If you've gotta have all of that and don't want to spend the bank, Mini-Mig.
I think Natami may wind up going the way of Mick Tinker's project(s), which while a shame is just kind of the way it goes.