Thanks for the thoughtful response, much appreciated. It is too bad about the Spirit Pro ear cup/pad size, really wish those would work for me but then again I have run into this often and suspect that will continue. One of the reasons I hold out hope about the new Senns is that they always seem to work out for me, except for the momentums of course.
I rarely have problems with depth of ear pads and driver screens, so maybe the MDR-7520 will end up being a good choice for me. I just tried the SRH1540 today and liked them quite a bit, but the cups done't rotate front to back on your head so the fit is a bit off for me.
Anyways, thanks again and continued good listening with the Spirit Pro, looks like a great design that is winning over a bunch of folks.