I would rather see an overclocked 68040 chip on a PDS card with some cache and modern high speed RAM. There is a new accelerator for the Amiga 600/1200 series that has a much faster modern RAM on the card and the speed improvement is pretty good (using a real 68030 CPU).
http://www.amiganews.de/en/news/AN-2010-09-00024-EN.html
The issue is few 68K mac users would bother paying for it. I have a 68040/50 with 128K cache in one of my 950's and it does rock, if you could mount that on a PDS card and stick in some super fast RAM it would be much faster and still be 100% compatible with all software that works on a 68040. Still there is a limit on how much I would pay for that setup.
If you are going to hack a CPU like a 68060 you might as well go PPC and then you might as well just get a newer mac for little on the used market. Amiga users spend the cash because there are no PPC Amigas to buy (well outside of a few super expensive rare upgrades and the A1 which will run old apps under emulation anyway).
http://www.amiganews.de/en/news/AN-2010-09-00024-EN.html
The issue is few 68K mac users would bother paying for it. I have a 68040/50 with 128K cache in one of my 950's and it does rock, if you could mount that on a PDS card and stick in some super fast RAM it would be much faster and still be 100% compatible with all software that works on a 68040. Still there is a limit on how much I would pay for that setup.
If you are going to hack a CPU like a 68060 you might as well go PPC and then you might as well just get a newer mac for little on the used market. Amiga users spend the cash because there are no PPC Amigas to buy (well outside of a few super expensive rare upgrades and the A1 which will run old apps under emulation anyway).