CM and CR mics

It seems that I've come to the conclusion that I need to pick up a good CM or CR mic. I've been playing through a few nice dynamic mics, but, as David says, every blues harp player needs at least one good CM or CR. I have an old Commando, but it seems to my ears to play too bright. I hear many good things about the JT-30 and Shure bullets, although I've yet to test the waters of a mic that big as far as good cupping (I've been using stick mics and an Electro-Voice 638). So, any advice or experiences, models, type elements, etc.?

I've been looking at a few Turner 254's with shaved fins. The size of those reminds me of an old Philips mini-bullet that I've used some for chromatic and alternative tuning playing, but that one is too clean and undistorted for full-on blues.