I am looking for the best keyboard controller for use with Logic 9. I want transport control, plugin/mixer control, with 49 keys and above, either weighted or semi-weighted. I am mainly considering the M-Audio Axiom pro 49, Novation Sl MkII 49, Novation Impulse 49 and Akai MPK61. Which one is the best, what are your experiences with them? Can all be easily auto mapped to Logic 9?