Have you tried the Sennheiser HD600 or 650? They fit all the way over your ear and very comfortable. I love the sound of the Senn's and thought they killed the Grado but those who love Grado feel the opposite. The HD600's I have do very good bass but it's a tight more precise bass where I thought the Grado was extremely exaggerated in the low end. I also find the HD600's far exceeded Grado in air and size of sound stage perception. I drive my HD600's with the Musical Fidelity X-can. I also have a pair of HD580's for the badroom I drive with an Onkyo receiver and I find the Sennheiser characteristics present here as well, just not as much.

Unfortunately not many places locally carry high end cans. So my only experience has been with AKG, Senn & Grado.