The DGL-4300/4100 is a great QoS router but with standard wireless. If wireless is just a "feature" for you and not a requirement (i.e. You use it on a laptop or something but not for everything) then this router beats most in its price range. Speaking of which, I saw a special on it in the [H]otDeals section.
The ZyXel is a good performing router with MIMO wireless. The default firmware is OK and its featureset is very nice for the money. No gigabit wired ports.
I just got the 4300, and I'm very impressed iwth it so far. As the last poster said, wireless is merely a "feature" for me and NOT a must have. I am very pleased with the wired performance and configurability.