It's a bit out of your price range ~ but I give rave reviews to a used Equation Audio F20 mic a bought a few months ago. It sounds incredible on strummed instruments (the reason I bought it in the first place) and brass. It wouldn't be my first choice for flute, but I have some excellent mics to choose from, and I daresay it would perform quite well if you're looking for a one size fits all mic. You would probably need to tweak a bit of the high end out of the sound if you used it for flute. I paid $240 used. They seem to be hard to find - not many of them around.