I've never heard the 750 but if the bass quantity is similar to Monster Turbines the Phonaks will not have anywhere near that amount of bass quantity. The Phonaks are a great all-rounder with a lot of good qualities, detail, and extension, but if you're looking for sub-bass quantity I don't think they'll fit your requirements, even with the bass filters.
Before reading joker's recommendation for you I thought the Dunu DN1000 and Yamaha EPH-100 could both be good alternatives to the 750 sound signature, so points for me I guess for being on the same wavelength as joker.
That was my thought as well. I forgot to add one caveat to my requirements a I have started this research over the weekend: I need iPhone Mic and controls. The Dunu and Yamaha are not going to get me those. This is turning out to be tougher than I thought.