with what i know of the SN puters (not a whole ton yet) and what i know of the fox puters (a good bit about the A9 series), i agree with White Devil.
the SN processor itself is superior to the fox puter (faster processor speeds, more funcitions, real diagnostics, etc). it just has some lame programming in it.
i would rather spend the money on a handheld (or a chip if that works for you) and retain the stock puter, myself.
and FWIW, i think the guys that were gonna 'start' Pro M back up are up and running - at least web site wise. I think Daggar has a link to their new site.
good luck.