If you want the most bass, closed cans tend to be the way to go (I'm generalizing to give you some information you can take with you). You should definitely check out the Denon AH-D2000, they are undesputedly one of the best reviewed cans on this site in your price range. The other thing I would consider if you want to try open cans is the Sennheiser HD580. You grab them for a steal and then buy the HD650 replacement cables and replace them. That's a super upgrade and it brings them close to the well-loved and much more expensive HD600s. In my opinion, that's what you want to choose between. The open cans will lack a little bass quantity (not necessarily quality) and they will add depth and width of soundstage that is much more "out in the world" then "in your head" (again, I'm generalizing for your edification). As far as comfort is concerned, both the Denons and Sennheisers are extremely comfortable. By the way, if you like bass, stay far away from AKGs.