Ok So i have an old Quick Silver g4 and I am looking to upgrade. I was thinking of building a PC.. but I have to confess that I am in love with the OS and I don't want to give it up.. I have been on craigslist and ebay looking for a dual core g5, but as other users in this forum, have been a bit leery and I don't want to get burned, by buying of craigslist and ebay. So what can I do . to protect myself. What diagnostic software can I use, when meeting someone from craigslist. And with ebay.. it seems like a crap shoot..lol Any help ??