ok, i need some advice. i'm getting a new pbook to replace my aging imac for the fall semester and figured that the 12 incher was a good choice. i dont want another G3, so the ibook is out. i will be using the university's wireless network, so airport is in no matter what. is the 12 inch pbook a good performer? also, i figure the 15 inch pbook will be updated soon. any word on when and what kind of update this would include? i might go that route if the specs are impressive enough. anything else i should be thinking of?