I haven't heard those, so I couldn't make any more comments or suggestions than I have. Might be worth it for the OP to investigate them though. My first post in here was just giving him an answer between the M50's and Beats. I'm sure there's something better than both for the money if you just want bass.
The thing I love about this whole headphone hobby is that there's something for everybody in every price range. I must note also, that, in my opinion, the ~$300 range that the Beats are in is really the sweet spot to find really great cans. Best "bang for the buck" price point I've found, and I agree with most that the Beats really don't belong in that price bracket; however, if the OP can get the Beats for the price of the M50's, then I would get the Beats over the M50.