If you're considering on-site recording, there's something that you need to take into consideration. The big thing is to remember is that the beauty of on-site recording is that it produces a recording that sounds EXACTLY like you sound. The biggest negative is that it produces a recording that sounds EXACTLY like you sound. This isn't a typographical error. The machines are mercilessly honest. They CAN'T make you sound worse than you actually do. It's a natural human tendency for your ear & your brain to interact in a way that during a performance you tend to gloss over imperfections in a way that makes you remember things as sounding better than they actually did. An unfortunate experience that I've had is to give someone a recording of their performance and have them say with a grimace "What did you do to the sopranos?" It's an impossibility for me to make you sound worse than you actually sound. I don't pay $1500 per microphone for microphones that can make you sound worse than you really are. And even though I have the capability of cutting & pasting & "punching in" replacement parts during post-production work, some things simply cannot be fixed. For example, even with close mic'ing techniques there are nearly always mics that must be some distance from their subjects (like drum overheads or microphones for vocal ensembles). These mics will unavoidably pick up more than their subjects & if someone else on the stage has excessive stage volume it is difficult if not impossible to attenuate or remove the offending "music". So, again, record yourselves AHEAD OF TIME to find potential problems and be really careful about wailing away on that sousaphone.
Something else you really, really want to remember is: If your on-site recording involves the use of an acoustic piano, be sure & check to make sure that it's properly tuned ahead of time including checking to make sure that it's tuned to match any other instruments that will be played during the recording.