I am looking to purchase a couple cameras with audio. I recently purchased a 4mp turret with built in mic, but the audio is unusable. Do the 2mp starlight varifocal turrets have a built in mic or audio in? What is the best solution for a sub $200 6mm or varifocal 2-4 mp camera with good.audio? I assume an audio in is preferred over a built in mic? I have cat 6 and 12v everywhere I need it so 12v is not a problem. Thoughts? Thanks!