Greetings, I have a Powerbook G4 (1.25 GB ram) running 10.3.9, and would like to get one of the new Nanos running on it. My plan is to purchase the retail 10.5.4 (Leopard) os and install. After including shipping, these are the prices at various locations: Apple store: $129.00 MacMall: $116 OWC: $122.49 Newegg: $109.95 Amazon: $103.99 Also, to my surprise, Newegg has 10.5.1 for $103.95. Any reason to go with one over another? Thanks.