I am looking to buy a powermac from a second hand shop this week. I am new to macs and the owner really doesn't know much about computers. This is what we know about it: Powermac G4 450mhz 256 RAM 20 Gig hard drive CD/DVD drive I have been doing research and it looks like the "sawtooth" model but I am not sure. Do these specs help to identify it? My other question - I am wondering if this we be able to run Tiger? Mainly will be used for web,email,IM,music and to test web pages with safari and some light web design. I want to know the model because I have heard bad things about the "yikes" and various reviews about the other models. I also am considering purchasing a sonnet G4 upgrade for 200.00 and have a pretty decent mac for 300 bucks. I have enough ram here to max it out. He is only asking 100.00 for it so I figure that is a pretty good deal. It boots into OS9 and runs pretty good as far as I can tell. Thanks!