I've used a few different mics over the years for stealthing, those being:
Oade Micro Mics - GREAT SOUND. I like to tape by the stacks, so they couldnt always handle the volumes, but the panasonic caps they use sound nice..
Core Sound Cards- Eh, not bad. Flat sounding, not alot of depth
Church audio CA-11 & 14's - a little too big for my taste with stealthing, they sounded good. I didnt use them too much because I liked the tone, depth and quality of my.....
Sonic Studios DSM-6S- A little bassy, but I use a rolloff, and "master" the show after recording.. The only downfall of ANY omni in my owpinion is in large halls, not up front, they sound kinda cavernous.. but if youtape in small to midsize clubs, stack tape, the sonics are GREAT ..
I would like to try the microphone madness sennheiser mics, and the Nevaton are great from the stuff I've heard.
Your mileage may vary,
Hope this helps a little
MarkE