Numark Red Wave. 70 bucks. Having tested these alongside of the entire Beats By Dre lineup, I honestly can tell you that these can deliver as much bass as the Pros and Solos. They don't quite meet the levels of bass that the Studios, but close. But that's a good thing. The Studios are way too bass heavy, too muddy, you can't hear all of the music the right way. The Red Waves are much more clear sounding, while still delivering a very hard hitting bass. If that's not enough bass, the Sony XB500 is the ultimate bass master under 100 bucks. It's not the clearest sounding pair of cans, but it smokes the bass from the Studios. Like, leaves the Studio in the dust. However, you sacrifice some sound quality in the pursuit of bass with these. Still, if you are just looking for bass, look no further than the XB500, but if you are looking for something along the lines of the Solos or Pros, go with the Numark Red Wave.
Hope this helps! -BiggBenn
Links: Numark Red Wave: http://www.amazon.com/Numark-RED-WAVE-DJ-Headphones/dp/B004M13GA4/ref=sr_1_1?ie=UTF8&qid=1358704733&sr=8-1&keywords=red+wave
Links: Sony XB500: http://www.amazon.com/Sony-MDR-XB500-Diaphragm-Driver-Headphones/dp/B001RB24S2/ref=sr_1_1?s=electronics&ie=UTF8&qid=1358705314&sr=1-1&keywords=xb500