I like the very feminine sounding voices. Mia Isabella, Vaniity, and Vicki come to mind. I would take Vaniity over the other two as she has a lot more to add when it comes to dialogue. Vicki doesn't bring much to the table when it comes to dialogue in a video (frankly she doesn't have to) and Mia just uses that same giggle over and over (probably thinking how her massive tool will plow that guy's ass), but Vaniity is much more natural with her words and she's the only one that really gets me hot vocally.