Still looking for some good mic suggestions as I'd like to pick one up in the next week or so. The pawn shop idea is not viable for me, so if anyone can point me to other sites or auctions (or has a mic they want to sell/trade), let me know.
From a pure mastering standpoint, and considering you are using Audacity, I'd seriously suggest using the Normalize filter. Audacity is a very decent tool considering that it's free.
Normalize takes a recording and evens out the levels so everyone is consistently the same volume.
I did apply the normalize filter, though the original levels of different segments were varied enough that it still didn't quite even out like I wanted. I also played with the amplitude of the first segment - this was about the best I could do. I do know the basics of audio editing, but I think that better equipment is probably the first step...