I don't think there is much difference between the Apple Retail experience and the online Apple Store experience (assuming you are talking about buying online at the Apple Store and not at other retailers). The support, with AppleCare, is the same. I purchased both my computers on the online Apple Store because I wanted custom options. When the Combo drive on my iBook G4 failed, I took it in to my local Apple Store, and they promptly fixed it, and even threw in a new keyboard (for the laptop)! I would go online if you want any custom options. I see you chose the GarageBand guitar as your logo. If you ARE a musician, you are going to need extra RAM, more than comes with the computer. I recommend at least 2GB for audio processing... the new iMac G5's have a maximum RAM capacity of 2.5GB, and that would do just fine, but be prepared to fork over some real cash for all that extra RAM. GOOD LUCK!