until recently i would have said cubase as i have always preffered the sound on it and the ease of working with it. But recently picked up logic 8 and is a marked improvement on 7 (which always seemed quite illogical to use compare dto cubase) the audio editing is better but maybe not quite as easy to use as cubases but that maybe be something that will get quicker with pratice using it. Going forward if you have a intel machine i defo say go with logic.

Ableton is ok, not been that awe inspired with that output sound but is ok if rewired. But it is very much more a creative tool and quick to work with . Maybe 7 will be a marked improvement and blow logic and cubase out of the water?