There's another cutting board material that hasn't been mentioned. It's a composite called richlite I believe. I have a board called Epicurian. It's kind to the knife blade and is very durable and can be put in the dishwasher. I've had my board for about a year and it still is in great shape. I bought mine at a local kitchenware shop, but it's also sold online at places like amazon.com, cooking.com, Sur la Table and some others. They also have a website. http://epicureancs.com/
I think it's better than the plastic.