I had the Denon Ah 1100, but did not like them. They had decent isolation, but we're very creaky. The midrange was very recessed. The bass was powerful, but it overwhelmed everything else. I think the UE 6000 would be a good option for you. It has good isolation , even when used without the noise cancellation turned on. Without the noise cancellation, it sounds fairly neutral. With the noise cancellation on, bass is more prominent.
I also have the AKG K550. The bass is very deep and textured, but lean. You can sometimes find them refurbished for around $130.