Most consumer cams in this price range will have manual settings buried in a menu and not easy to get to. Most consumer cams in this price range will have small lenses and small imaging chip making good light capture impossible. If the talent is on a lit stage, then they won't be in low light...
I'm currently a concert photographer and looking to also get into HD video and don't want to buy another DSLR (Canon 7D) for video only. Looking for recommendations under $750 if possible and it has to be low light capable and I'm not afraid of manual settings.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic