I'd probably go for amazing pianist over great surgeon.
Im not too fond of carving up bodies! Bro is a surgeon, and I dont really like it when he shows me pics of body parts from the inside. eek
The only thing with being an amazing pianist though, is, you might get a crick in your neck and sore knees from practising all the time at the piano. I dont know if the fame and fortune makes up for it. Then if you have a sister whos an amazing drummer and singer, she'll steal the limelight.
Just thinking of the Carpenters. However, your amazing compositions will live on forever.