I'm currently listening to a pair of PMC DB1+. These really pack a punch, especially for their size. Good monitors for nearfield listening. Not sure how they would work for your garageband mixes as they are revealing. Not harsh though.
Bookshelf or Mini Monitor
Looking for suggestions on speakers for large desk top. Room size is 15'x16'x8'. I will be using with imac for music playback of itunes and garageband mixs. An Arcam FMJ 22(100w) will be used as amp with Blue Circle usb thingee. So, looking for good nearfield listening and something that is not overkill considering the music source. New or used is fine.