Just to add a final point.
If youre going to attempt to mix it live, and youre not 100% sure of your ability in that area, then it might not the best idea.
in mixing 3 mics you have to be able to
balance the levels of people live, whilst never missing the start of a comment from another BUT you cant have all mics open all the time or youll end up with
1) lots of background noise, and hiss
2) horrible colouration (where the sound from people is heard through more mics than their own)
Speaking as a post production mixer, Id rather have 3 separate tracks of good recordings of 3 mics that i can balance out in the mix. I know I can get it right as I can wind back as many times as necessary to get it right. Without that I am totally at the behest of the skill (or lack of it) of the recordist in mixing.
Actually id like 4 tracks (3 personals on sep tracks and a rifle mic on a stand about 6 ft away to allow some air to be mixed in as i prefer in the studio.
The question is
Do you equippe correctly for the job, or force the job into your existing equipment.
This is probably a key difference between a non Pro and a Pro.
Peter
Post Production Dubbing Mixer