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You'll want some kind of shotgun mic. The rode videomic2 is a good budget option. It has a standard 3/8" thread you can use with a desk boom.

Sennheiser MKE-600 is next up for me. have a graveyard of other mics that don't sound as well for my voice.

Listen to a bunch of the shotgun mics on youtube and see which your voice might sound the best with.

I've been using one for a few years now and am really happy with it.

Every now and then (once every 1-2 weeks) it drops off of the list of inputs on OSX but unplug and plug it back in usually fixes that.