I think possibly my favorite clip of all time was kinky Kerri on Meatholes. That one point of her session when you can hear Khan in the background going 'Jesus Christ!' as she gets roughly fisted sans lube and is loving every minute of it is probably the best example of this I've ever seen.

I'm attempting to assemble a list of whores with a similar level of... passion. (Let's go with passion. Brain damage may also be appropriate.)

Thus far I have

Debi Diamond
Ava Devine
Kinky Kerri
Annette Schwarz (Schwartz?)
Adrianna Nicole

Any other suggestions?