Shure SM57 or SM58, 100 bucks.
Not to be argumentative, but the SM57 and 58 have midrange boosts built into their frequency responses, to make vocals more intelligible on PA systems. The SM57 is the industry standard for recording snare drums, as it makes them POP!
For accuracy you want a condenser or ribbon microphone, as used in studios for recording vocals. Research the subject on sites dedicated to recording for current models in various price categories.
I agree with the Zoom suggestion, I've had great results with these. Depends on what you're making your videos with. If it's a mobile phone or DSLR, probably easier to get a mic that connects directly to it.
You can get into the different mic types, but it gets complicated