Hi Leo,
If you're primarily going to be recording groups rather than soloists, you may want to look at getting 2 mics instead of one so that you can do stereo recordings. If you go for 2, try to order them as a matched stereo pair so that you ensure that they're consistent in their sound.
I think that you'll still need to set budget though. For example, the Studio Projects mics are great for what they are. However, in order to get the price down, there are corners cut here and there. Although they are typically compared to Neumann's, they are *not* a U-87. Don't get me wrong though, they are great mics in their price range.
Also be aware that mics, even high-end ones, have a sound. As I mentioned previously, some are darker, some are brighter, etc. At the end of the day, you need to be able to get the sound that you want. The less EQ-ing you can do, the better the mic is for your application (keeping in mind that the room will affect the quality as well).
I hesitate to suggest/recommend a particular brand because I'm not sure what sound you are after. Let me offer my thoughts and a few different ones possibly to try. In the low-to-mid end of the price spectrum, Studio Projects and Rode make some decent mics. In the mid-high, you can go with tried and true Neumanns or even Microtech-Gefell. The MG mics are great IMHO and the company was formed by some ex-Neumann people IIRC.
If you will not be able to test mics out for yourself (due to unavailability), I would recommend that you stick with mics that are known as more neutral-sounding. Mics that are agressive or have a particular sound may not be desirable in many different applications. Also, since I don't typically record choirs myself, I would highly recommend that you try to find out what mics are mainly used for recording choir. That will probably give you the best results for your money IMHO.
Also, keep in mind that there are many great mics available today at many different price points. The companies that I mention above are not the only ones and also may not be the best for your particular application. When you've decided on a few different mics, research as much as you can to determine what their strengths and weaknesses are.
HTH,
FV