The problem is that these woodwinds like flute and clarinet may sound very pleasant on one keyboard and very toylike or even painful on another. I have Roland Juno DS and I’m sad to say that I don’t really enjoy these sounds here. I’d say that Yamaha even as old as PSR-3000 has better ones. Since you don’t plan to play with styles I would agree with Crossover that an arranger can be not an obvious choice. An arranger usually has its own speaker system which means a lot of extra weight and extra cost. I guess Yamaha MX61 could be a good choice, just as something from MOX or MOXF series but I have no idea about how a clarinet sounds there. Motif, Montage or MODX can be a good choice too, but they obviously cost a lot. On second thoughts, PSR-S900 might be a better choice, to my taste these MX, MOX, etc., are a bit too “geeky”.

Also, judging by Data Lists, PSR-S670 and PSR-SX600 have some good clarinets too. Maybe you’d find some good deals on new ones. Obviously, an older keyboard might need some service sooner than a new one, although it’s not always the case.