Thanks for all the feedback. I think I am going to try a LDC on cello and hear how things sound. And rather than buying a ribbon mic, I think I am going to purchase one mic specifically for my vocals-- a Shure SM7b.
The KSM27 definitely looks like a possibility. If I were to buy a mic specifically for miking cello, would a small diaphragm condenser be ideal? I've heard they're a bit more sensitive and pick up more detail on strings and acoustic guitar...
What are some good mics, either condenser or ribbon, for miking a cello? Ideally I'm looking for something that would also work well miking male vocals (specifically baritone) and under $300.