Woodwind? That is a tough call. Just about all synth reproductions of horns of any sort prety much (although sounding cool for techno) suck as far a realisim is conserned But there is one that comes to mind that is actually prety good (if your willing to spend about $500) and that is the Korg Trinity module it also has grate string sounds and lots of other good REAL type sounds. It is also a functional synth! So you wouldn't be wasting your money. Prety cool
Other than that, if you want a perfect sax or claronet you might have to go with a sampler. If you end up going that way, try as hard as you can to get an Emu sampler (used or new) all other brands make things sound way too fake, weird or just plain noisy.
Good luck
look around and let me know what you find