Shure SM81

Larger diaphragms and directional microphones are going to emphasize on axis contributions and de emphasize anything off axis so you will end up with a PA whose perceived tonality doesn't match the measurement you're producing, even if you started with a relatively neutral microphone (an SM81 for instance). You can get a perfectly serviceable measurement microphone for under $100 these days and if you're interested in measurement it's a very good investment. However if the primary goal is "make it the same everywhere" you could probably get pretty close using just about any mic you have lying around, particularly if the space is relatively non reverberant.

Those familiar with this sub probably think I’m a broken record about this mic thing, but you’re about the 17th person I’m going to advise against buying one of these cheap mic packs. You can get a really high quality full kit sound by spending the same money on two or three good mics. If you want to go Shure, get a Beta 52 for the kick, an SM57 for the snare and an SM137 or SM81 as an overhead. These are three mics that will sound great, last a really long time, and a quality core around which you can build your mic collection.

Yes the SM81 is apparently pretty quiet. Most condenser microphones have a high output, so the SM81 is a little unusual. If all you do is record quiet acoustic guitar, the SM81 could be the wrong mic for you. If you have other uses for the SM81 like recording loud sources, it may be worth goofing around with an outboard mic preamp or outboard mixer and see if you like the sound.