Saxophones aren't expressive, saxophone players are.Need a new alto, can buy a used A990 for a good price, or grab one of those Kessler deals - A901 for 2 grand, A991 for $500 more. Then there is the bronze A992. Which model is more expressive for contemporary music?
I'm also confused by your term R&B and then ask about contemporary. Most people tend to think of it as not a contemporary genre in relation to the saxophone. Of course the term has been hijacked to mean something else now in regard to vocal and pop music, but R&B saxophone tends to mean players such as Big J, Lee Allen, King Curtis, Eddie Vinson, Louis Jordan, Sam Taylor, Red Prysock.
Great R&B horns? Bundy, Kohlert, Weltklang, Buescher, Martin, Conn