I recently bought a imac g5 1.8 with 1gb ram. I believe this one came out in 2005. I wanted to buy a used mac to play around on since I've used a pc for most of my life. I'm planning on using it for music recording. A few things: It came with tiger 10.4.11 and I'd like to upgrade to 10.5. Will Leopard run ok on this system? Should I upgrade the RAM to 2GB and if so, what memory sticks work the best in an imac? If there is anything else you think I should know, please fill me in. I really appreciate any advice on this system. I'm excited about diving into the mac world. PC's just have so many issues and I'm getting tired of dealing with them. Thanks!