If you already put km140's at the top of your list Nick, I'd go with the km184's. The 184s sound almost identical to the km140s, which is to say very good. You lose the option of the actives and capsule switching, but you'll get very good mics for the price. I think Ed Swearigen's got a used pair for sale right now. As you know, if you buy used, they'll hold their value, so if you don't like them you could always dump them.
I ran the 184s for about 2 years and made lots of great tapes. I never had a problem with the fixed cards. The cards are what you want anyway when you're running neumann SD mics. Excellent in good rooms, onstage, and outdoors. If you're running farther back in a situation when you might choose hypers, I had great success running a modified NOS with 11-12" spacing and 70-80 degree angle. The greater spacing preserves the soundstage and imaging and the reduced angle cuts out the room boom.