I suppose it depends how classical a tone you are after for Concert, but if you avoid pieces with extreme baffles etc you should
be able to satisy both requirements with one peice. I wouldnt get too caught up in the cosmetics, some of the peices that the giants of sax played and sounded great on looked awful, many didnt have balanced rails even, but they got by.
Sounds like you might be looking for something a bit more open than the 4c, to be more free blowing, but the flip side of that is you have to work harder on intonation.
In the price range you quote a used Meyer would be the default choice, but they can vary a lot out of the factory, so something like a (used) vandoren V16 (A6M) would be very similar, but more likely to work straight out of the box. If you can though, try pieces before commiting. I dont have that option where I live really, and I have had good luck with mail ordered/ ebay / SOTW marketplace sourced Vandoren pieces in the past, although right now I play a selmer super session on alto that came with a sax I was given (pretty lucky find!).
Having said all that, the best player I know round here kills
on a stock Yamaha 4C... Go figure, its the player, not the equipment