Reply to Recommend me a keyboard/synth for piano lessons.

So I have a years worth of piano lessons lined up starting next friday. I want to do this because I want to get more comfortable with coming up with my own melodies when producing and music theory.

The teacher recommends I buy this:
http://www.thomann.de/be/yamaha_psr_e243_set.htm
It has MIDI out for PC and iOS but not for Mac (is that even possible ?) and I have a MBP

But thought it 'd be more fun to get an actual synth like a MicroKorg or MiniBrute (I believe these have aftertouch)
But maybe they don't have enough octaves...
Or at least get something that 'd be fun to use with ableton or something.


What would recommend ? (search on the community wasn't much help)
The music school that I go to is pretty alternative and loose, and we are really free in the music we want to play.