I'm not sure what you want by "bass". If you're looking for something with a little bass bloom, orthos aren't the way to go. Orthos are generally very tight and controlled with bass. The Mad Dogs have bass that can go down, but it's very controlled and balanced by the rest of the spectrum, so it's not overpowered.
I am looking for powerful bass (not overwhelming or muddy). You just helped me narrow down my list to M-100, Momentum and Ultrasone Signature DJ. I am also eliminating Yamaha based on the poor design and the AKG K267 Tiesto launch is too far away.