I own a '52 keilwerth new king, made in germany, which got a general overhaul 2 years ago, but (on my demand) no new finish, since I really love an old looking instrument as long as it really is old and I also was afraid a new finish could alter the sound of the horn to much... I loved it and it has a great intonation, so good for beginners/intermediates...
I dont have the time to play it anylonger, if youre interested, pm me...
If you don't want to buy used, i'd recommend selmer, keilwerth, yanagisawa and yamaha... you can't go 'wrong' with those instruments.. but I think selmer will be a little bit too pricey

(You should take a look at the Yanagisawa A-901 alto... I plaied it once, and I think it's really nice for ~1700,-)