I'm sitting here with my beloved G4 Sawtooth, having leap-frogged G5's and am realizing that the time has probably come for a new workhorse. The great joy of the G4 over the years, has been the ease with which I've been able to upgrade almost every part of it as my needs evolved. A new MP Octo would be a less intimidating expenditure if I thought that in the years to come, I would be able to swap out **the processor**, particularly, for whatever wonders the future may hold -- something that (correct me if I'm wrong) was not easy on the G5. Are the Octo processors swappable? Or if you buy an MP Octo, will you be locked into whatever processor it ships with for the life of the computer?