125cc is approx. 1 cup size increase
so I think if your starting at a 34c with 590cc you’ll get about 4 to even 5 cup sizes increase.
I think about an F, though if you have a little amount of breast tissue I’d say around an E 🙂
Everybody is SO different, so trust your surgeon. Singh is known to do big boobies, and a few people I know have had him, I’d be prepared that you may end up a size bigger with him lol xx