The Yamaha APX range is very extensive - some very expensive, some very cheap and there is enormous variation. yamaha quality control guarantees a decent quality, but I will agree with what some people have said that acoustically, most models don't really kick ass. Plugged in, I think they are damn good.

The Yamaha CPX range is a style called concert style - not quite as big as a dreadnought. the CPX 9000 are a bit stodgy acoustically, but they are fitted with the new ART electronic system, which is simply shit hot good!

Yamaha have since come to their senses and started fitting the ART system to their more expensive models, but you may be lucky and pick up an early model from about two years ago second hand, in your price range.