"Master" is a relative, term, but I'd asy if you were even comfortable playing alto, then taking on soprano is a reasonable quest. Intonation and embouchre are tougher on soprano, so be patient and give it time, but as you are strengthening your chops on soprano, you will find your alto chops get even better. I'd say go for it. As far as curved vs. straight, I've had both (Yanis) and favored the straight. I need it for legit purposes in a concert band and in church and I found the curved was just too bold. I preferred the somewhat more indirect sound of the straight than the (literally in your face) sound on the curved. Someone who is using it for jazz or solo work might prefer the curved. I also found the straight a bit more ergonomic. I'm 6' 2" and it just seemed more comfortable with my long arms to have my hands slightly lower and more in front of me when playing the straight. As far as makes of soprano, I'd say stick with the larger brands. You can't go wrong with Yani.