Sennheiser HE 1 unless u are a poor boy
if you want the best bass, dont get bass boosted headsets, get one with a really flat frequency response and then you can EQ it exactly the way you like. that does mean paying top dollar for a quality headset, beyer dynamic, sennheiser, for example.
and not the cheapest model either, you need one with a lot of power too
By bass "quality" do you mean the amount of bass or sub bass extention or low distortion?
The best choice is to hear it yourself. Have a try and choose from several ones at nearest audio/electronic store. They also have different fit, look and price. And I guess you need not a huge amount of bass itself, but rather a good dynamic of sound. In this respect I can tell a word in favor of Monster DNA On-Ear, but they demand a nice source capable to work with low-impedance cans.
why would anyone want bass heavy headphones
Got Sennheiser HD 4.40BT
couldn't be happier with them, easily one of best i've ever had