A simple table will give you a quick idea of each swara note when you choose a particular pitch.
If you want the E note to be your Sa, what will be your Ga3? (the G# note)
You want to sing in the pitch of A? Then D note will be the Ma1, F# will be the Dha2 and so on.
If you want E to be the highest note you play, and if M1 is the highest note in the song, then which note should the Sa be? (B is the Sa when E is the M1)