I usually like my cards but when would ominis come into play? Any insights on mic configurations are appreciated!
IMO omni's do not come in to play in your situation, MAYBE if you're outdoors. If you're not convinced definitely try them yourself.
I see you have a ua-5. You can run a sbd + aud matrix, although you will be required to mix on-the-spot. This is risky, as I've ruined more than one recording because the sbd was too hot in the mix and it sounded like crap. If the band is quiet to begin with, you can get good at this technique with practice and noise-cancelling headphones. The bands I tried to tape were typically loud and it was difficult to hear the mix in the headphones.
Don't try to tape from the lip unless they are amplified or the bar is empty. Just find the sweetspot in the room is the best way for 2 mics.
Matt
Matt is correct, 2 mics in the sweet spot will be very consistent, predictable, and can sound good. However, some of my best matrices were with stage lip + sbd. If you're not running the sbd feed then skip the stage lip like Matt said, it will be hard to get the vocal even if amplified.