I use some samples of mad zach from techtools, however most samples I use are professional samples from loopmasters.
All my samples that need voice produced for me exclusively I get from musicradiocreative.com
They follow my directions best and usually the first try will get the result I want. The more specific you are in how the words should be spoken or sung by the vocal artist, the better the result. Also their F/X and music for the voices are good and flashy without being over the top.