What cell phone from at&t that has a full keyboard should i get?

I'm thinking of getting a new phone. I currently using at&t and have a razr. I really want a phone with a full keyboard. I was looking at the pantech duo which is like the enV but it slides. However I don't want a phone with widows mobile. Then I was looking at the palm centro and the blackberry but I didn't really want a real smart phone because I'm just a teenager and I want a good cell phone for texting with. What would be a good phone from at&t that has a full keyboard, doesn't have windows mobile and is good for a teenager?