With 2 teenage boys I think you might like Via Napoli for EPCOT. The have a huge pizza, a fun atmosphere, and reasonable prices. The pizza is awesome - our son, 17 at the time, ate a whole huge pizza by himself and got a pic with the servers! They have a full Italian menu if you don't all want pizza.
For Magic Kingdom, we like Skipper Canteen. We are not adventurous eaters, so we get steak or chicken. Great location, great theme and great service.
We also really like Steakhouse 71 at the Contemporary. The only downside there is that it is not a very unique restaurant - but the resort is!
For AK, we do Rainforest Cafe, which most people here on the boards dislike. We love it for the unique theme, food is like Applebees quality. Not expensive for Disney.
For HS, people like HDB, but we have never been. We are trying Mama Melrose this trip with the Fantasmic package.