Guys, I am a long time PC user ready to switch and I'm very tempted by the 17" refurb iMacs that are selling at the Apple Store for $1599. It's only $200 cheaper than retail, but it's hard to get any Apple products for less than retail unless you risk it on eBay. I had a couple of concerns that I was hoping for input on: First of all, I think the iMac uses laptop memory if I'm not mistaken. Can I simply add a 512MB DDR laptop stick to it and have 768MB total RAM? Also, what size of hard disks does it take. I hope they are not the 2.5" laptop size because I'd probably want to replace the internal disk with a 120GB or 200GB straight away. Is this user upgradeable (by someone who has built tons of PCs), or is this box really like a laptop in a desktop case that you aren't allowed to crack open without voiding the warranty? Just FYI, my main purpose for using this machine is music production. I use Logic Audio Platinum, as well as Reason and a number of Cubase VST plugins. I know not having a PCI slot is kind of limiting as far as sound card options go, but it seems that all the new sound cards for pro and pro-sumer use are Firewire or USB enabled so lack of a PCI slot isn't the biggest deal. Perhaps I should just go with a refurb PowerMac instead though, because for about the same price I can get a 1ghz. Dual G4. Thoughts anyone? Thanks for your input.