I have a Edirol FA-66 which has served me well but the unit is starting to fail so it's probably time to upgrade. (I never did like the need to turn the inputs nearly all the way up to get a decent recording with the FA 66). I need 4 inputs, 2 mic with phantom power and at least one Hi-Z, two line ins for my older synth (Roland XP-30), and midi in and out. I don't care whether its USB or Firewire as long as it works well and will last. My computer is an intel iMac (last year's) 2.8 with 4 gigs of ram. I'd also prefer to have a single unit plugged into my system rather than a separate audio and midi interface. I'm not a pro but I like good sound and I have a price range of $200 to $500. I'm finding the choices out there quite bewildering. Any advice would be appreciated.