Seems to be different types of Amiga user wants here.
Those who want the ability to towerize an amiga with all the trimmings. Most who want this have already done so. Those who have/haven't just want it cheaper.
Those who want to keep it in the original case A1200 etc. or in another case, but not a tower setup. Not as much developed for this yet, because 1 cpu and 1 clock port not enough for Vid, Snd and other expansions.
Those who want a new mobo for a tower unit.
Those who want a new mobo more compact.
Then the obvious CPU - 060, coldfire or PPC ?
This thread started about classic Amiga stuff.
If you want a system to play all the modern games on then buy a modern machine. Those who want OS 4 and/or G3/G4 etc already have choices - ie. AmigaOne, MicroA1, Pegasos, Shark and Blizzard PPC etc.
The weakest availability for upgrades is those who don't want to towerize. Example - no way to upgrade video, audio, usb, ide and enet at the same time.
A1200 060 cpu with a video upgrade ability and a couple of extra clock ports or something might be a start !
I have read the ColdFusion plans for the A1200 but it does not include any kind of video upgrade ability so going to a tower is the only option. Unless one is developed of course !
To me, a new mobo with Coldfire? would be the thing. My Amigas are starting to die off little at a time. Good thing I got a NOS A1200 a year back as a back-up.
A lot to think about. :-o