Elektron Musical Instruments

So just make  achoice
>between Cubase, Logic, Digital Performer, Sonar, Live or Pro Tools if you
>have the money

Pro-Tools is not a sequencer, it is a DAW (although it has MIDI
capabilities).  Pro-tools MIDI is pretty sub-par as far as features go,
although HD has some improvements.  Nevertheless, you DO NOT want to buy
pro-tools for MIDI.  Pro-tools is for very high end pro audio - and it costs
a shitload of money to get a rig up and running.  The free version sucks
balls and shouldnt be used for anything except instruction.

Evilataombender, since you are clearly a beginner, you should probably go
with Sonar.  I think it is probably the most user friendly of the bunch.
Its not the best, but you should start simple.