I've have the C1 and the V67 and they are both nice mics. To my ears they are different flavors. Then again, I spent the 70's holed up in my room with Black Sabbath blasting in my headphones. YMMV. The C1 is brighter and has more top end. The V67 has less top end, and a less "airy" sound. I've used both on vocals with great success.
I'm not impressed with either for acoustic guitar. Depending on your taste, I'd suggest looking at a Studio Projects B1, MXL 603 or Oktava MK012 for guitar.
For <$200 I think I'd get the V67 and the 603
If I had <$300, I'd get those 2 and the SP B1. You'd be pretty well set with that.