I plan on getting a 20" iMac and had a few questions regarding hooking up several bus powered devices. I recently purchased a M-Audio Radium 61 keyboard that I plan on hooking up to the imac. I also plan on getting a M-Audio Firewire Solo for guitar and vocals. Both these devices plug into the computer and are powered through the usb/firewire connection. My question is, with all the talk about loud fan noise and heat issues with the iMac, would powering these devices through the iMac be a problem? P.S. I am also more than willing to hear suggestions/opinions on my possible studio set up. Are these components any good? I am a total amateur just trying to get some simple songs recorded.