ottomobiehl wrote:
You will only be able to use it in c64 mode with the SuperCPU. IIRC, GEOS, Contiki and Wings all work in the c64 mode of the 128 so you won't be able to take advantage of 80 column mode.
This is definitely _not_ true. The SuperCPU 128 works both in 64 and in 128 mode. Geos (128) and Wings also work in 40/80 column-mode on the 128. Contiki is indeed just for 64 mode. I have it setup like this at home.
If you have the 64-version of the SuperCPU it will indeed only be usable in 64-mode, ofcourse. Therefor go for the 128 version.
Tip: keep the 128D. With a 64 and a SuperCPU you would also have to find/build a more powerfull PSU, while the 128D's PSU is more than adequate for the task.