Need help with vintage alto saxophones?

Right now i'm going into 9th grade but i really want a new alto sax. now i have the yamaha yas-23 and its a beginner. im quickly excelling, i take lessons, have won many scholarships, and am in jazz band. I want a new sax because i want something more professional and i don't want my sax to get beat up in marching band. I'm thinking about buying a used one because i cant afford a new one. The only saxes i really find are vintage and i just fell in love with the Selmer Paris mark VI but of course its really expensive. What are some other good brands or models of vintage saxes? and What are some websites that i can find used pro saxes such as the Yamaha 875EX?