The main reason I did not buy the TiBook was that I was in love with the Pismo's Expansion Bay. However, today (via MacMinute) I found that both Newer Technology and PowerLogix are offering a PowerPC G4 Processor at 500 MHz for $299. I was wondering if this is a good idea and if anyone has done anything similar. Also, does anyone recommend one of the companies because of past experiences? Thanks for your help.