Rob,
The C-3 deserves the best microphone preamp you can afford to put behind it.
If you've got some time before making your final purchase decision, and if you're seriously considering the Studio Projects line, then I'd suggest you send an email to Alan Hyatt with your name and address, and he'll send you a copy of their "Sessions" CD (without charge), on which you can hear both mixes and dry vocal tracks recorded with the C-1, C-3 and T-3, recorded through five different preamps (only one of which is a JoeMeek product).
There is also much good information to consider on this board, which you can access by doing a search on any of the mics you are considering. If your situation is such that you cannot listen before you buy, then it's best to read as many people's opinions as possible first, especially noting the experience of those who are writing.
Other resources that I've found useful as a beginner to recording are the mic and preamp comparison discs available from 3DAudioinc.com. While mic and preamp shootout recordings have obvious limitations, they can nevertheless be useful both as ear training and to narrow (or expand) the list of microphones you'd like to audition further.
Generally speaking (with regard to posting here), the more specific information that you can provide about yourself, your experience, your other equipment, and your vocal style, range and the types of music you sing, the more likely that more experienced posters than myself will be able to give you more useful and specific feedback.
Best wishes,
Mark H.