I don't know about DFH superior or BFD drums but the Producers Ed is the one you want and yes it has the piano role interface and operates as a midi sequencer as well as an audio engine.

The only thing to watch out for with Sonar is all the hidden extra costs. Cakewalk love to charge you for everything !

If you are going balls out you might want to consider a copy of Waves gold. Expensive but if you have that and Antaries Autotune there is not much you cant do.

The only bad thing about SOnar is the Audio to midi engine is not that hot (if it is there at al. Another reason for using Apple Logic which will convert your Audio into midi and then either music or tab ! You can write in Music or tab and have it played back through midi. ! Cool hu !

Logic also comes with all its own plugins...oh yea !!