#1
I am looking for any program that I can create piano compositions just by plugging in the notes onto the staff, setting the tempo and what not. Basically like something similar to PowerTab, but for Piano.

Any suggestions?
#3
That's a good choice, because you can then simply export the MIDI and apply it to a track in a sequencer with a decent piano plugin. I would take a look at Sibelius, which is really top notch for this sort of thing.

Doesn't come cheap though.
There is poetry in despair.