Don't buy a wooden one for a beginner! The cheap wooden ones just aren't worth it, they're mostly made of soft wood and need far too much looking after.
Yamaha and Aulos are both good in different ways.
Good wooden ones are fine once a child really shows an interest and an ability. Plenty of people take Grade 5 and above on plastic. They can be washed, dropped, left in a hot car or out in the garden overnight and won't mind. Wooden ones are rather precious and new ones have to be "played in" gradually over several weeks.
The Moeck plastic/wooden one is nice although I don't think it has a particularly strong sound.
Recorder buying can get surprisingly expensive - we know someone who paid nearly £1,000 for a descant, and the larger sizes are easily that.
Just wish the recorder didn't get such bad press, it's just as valid an instrument, when played properly, as a violin or piano.
The Saunders Recorders website has lots of recorders as well as down to earth information. What the proprieter doesn't know about recorders isn't worth knowing.