I've completely had it with Microsoft, and the change to get back to a child of NeXTstep has me hooked... I'm in the market for a PowerBook. Of the current models, only the 17" looks durable in terms of technical merit (no cache on 12", inferior memory bus on 15"), but I'm still hesitant with all of the rumors flying around. Ideally, I'd like to get this out of the way in the next couple of weeks? Any thoughts? Relative merits of upgrades versus usability of current 17" powerbook?