TO the question at hand:
if you are taping in shitty venues, omni's are not going to be the most desireable, I'd say. You'd probably be better off with cards or hypers (or running a filter on the mud zone in post).
Plus, if a certain mic sound amazing to you, then get those. Ultimately, they are your tapes, so you should get what you like. My personal bent is to stealth omni's ALWAYS, for 2 reasons-
1) I listen to my recordings in headphones all the time - so it is desirable for me to record in binaural. At this point, I see the 4061's as the best omni's I can afford... and they are stealthy as shit... and I can do without versatility in mics cause I only use omni's for stealthing. It is also nice with the 4061's that you can get maximum performance from a battery box, as opposed to phantom power - which means less to carry/hide.
2) I've had bad luck with even the most minimal movements by me, or someone around me, causing effects on the sound in the recording when using cards and hypers for stealthing.
but YMMV. These are just my experiences.