as a long time cubase user and closet Logic bi-curieuse
id go with ableton :)

i would doubt that you would need the monstrous functionality that Cubase offers, and if you are on a PC, you wont be able to use Logic. the synths and effects in Logic are great, however if you get yourself some nice VSTs, Ableton Live would match that IMO. plus with the new live8 coming, I truely believe that the Ableton Squad have surpassed most other DAWs.