I'm a little late to the game here, but I own the Ecodears and the Aulos higher end series (I also used to own the higher end Yamaha ABS ones, but gave that to my daughter who needed a set for teaching). I find that the Ecodears sound sweeter, closer to the sound of wood than the Aulos. I can also tell the difference in how the material vibrates when I blow. ABS gives a more pronounced, hollow vibration that is more discernible than the vibration on the Ecodear. Given a choice, I would go for the Ecodear. It's sweet in the upper range, but you do have to control it, and it needs a tighter embouchure to play the high notes cleanly.
However, you can get one of the less expensive Mollenhauer Dream recorders for about $50. They have a plastic mouthpiece but a wax-impregnated body that is easy to care for. I actually own the plum wood soprano Dream, and am saving up to get the alto. I've played so many different recorders, but I certainly have my favorites. But for a beginner, I would recommend a Yamaha Ecodear or the Mollenhauer Dream.
http://www.lazarsearlymusic.com/Mollenh ... .htm#Dream