paddyponchero said:
You could rent them or sell them when you're done on ebay might even be cheaper.
Yes, rent them, along with a couple of other mics for the soloists and narrators. I use my 81s along with KSM27s for soloists and 58s for narrators all the time.
If this is for a CD project, then I presume you are burning at least a few hundred CDs, so on a per CD basis the rental ($100 for 4 mics for 3 days, we'll say) is well less than $0.50 per CD, and it's money well spent. If your mic budget to purchase is only $100, you aren't going to get a very good CD.
That makes me wonder what the rest of the recording chain is like. Doesn't have to be super expensive, but $100 for mic rental into a couple of decent pres into a Tascam 4-track can get surprisingly good results. A bunch of cheap dynamics spread out 1 for every 3 choir members (too many church choir members like lots of mics) into a PC . . . good luck with that.
Another way to go is with installed sound; those little ceiling-mounted condenser mics for the choir, a halfway decent 16 channel board, etc. That way the choir has the system for every service, and you can plug in a recorder whenever you like. More money up front, but very cost effective over time. That Shure guide is excellent for stuff like that, have a read:
http://www.shure.com/pdf/booklets/audio_for_houses_of_worship.pdf
This guide is so good I think it should be required reading for every aspiring sound tech BEFORE they are allowed to touch a church system, and nearly all of the mic placement principles are applicable to recording too. Seriously, read that thing front to back three times.
The thing it doesn't touch on is coincident stereo mic techniques, which are commonly used for recording, but not live sound since live sound is usually mono. Also live sound placement is usually closer, since ambiant sound is not desirable through the PA.
http://www.prosoundweb.com/install/spotlight/bartlett/bartlett.shtml
http://www.soundonsound.com/sos/1997_articles/feb97/stereomiking.html
http://www.audiotechnica.com/using/mphones/worship/index.html