Well, if I can recommend my own, then here it is:
http://www.wowinterface.com/download...24-freeUI.html
It's fairly minimal, if you're into that kind of stuff. It's made from a dps/tank POV and should work fine for hunters. Happiness-coloured pet frame, threat bar showing your threat (or that of 2nd in threat if you're tanking), clean overview and minimalistic raid frames.