I'm about to upgrade from a Treo 90 (yes, I've been holding out for sooo long) to an unlocked 680, and I was wondering what are must-have accessories. At the moment this is a PDA+cell phone usage (probably go with T-M prepaid minutes, no data service). Is the Palm cradle+extra battery for $80 worth it, should I wait until Seidio comes out with theirs? How about the "Now you know" book? With the exception of perhaps cases, anything for a 650 is usable with the 680, correct? It looks like only the cradle+extra battery may be the only accessory deal at the palm website.