I am wanting to spend between 150 and low 200's for a vocal mic. Which of the at4040 or the C1 would be better. Or is there another one that I'm missing for about that range?
I would go with the AT4040
Audio Technica is an established company with a good reputation. Admittedly I have never used a Studio Projects Mic and most likely never will as I have been turned off by the antics seen on this BBS.
I have been using an SP B-1 for alittle while now and have been quite impressed by it on acoustic guitar, so impressed I will probably get a C-1 in the near future.
The AT4040 is the more quality mic but the answer should be to get the mic that's right for you.
The C1 is a large condenser with a hyped high end that can do a good job on a lot of male vocals.
The AT4040 is a more balanced mic and it seems more open sonically. It can get fairly good results on a number of sources including male and female voices.