Hybrids are the worst of both options. The geometry makes them uncomfortable for longer road trips and don't handle trails well.

The Hardrock is a very decent mtb for the price, can either lockout the front fork or swap it for a stiff one for street riding plus get slicks put on and have a second set of tires for off road.

Can also look around in the Cyclocross forum here and check out some of those options. I ride a roadbike in the city with no problems in terms of road roughness (and I'm a Clyde (big guy)). Those are bikes that can handle road and trails well - beefier fork and frame to handle the roughness but also light and fast. May be slightly out of your price range but might be the better choice. In the Clyde FAQ in my sig I have a section on different kinds of bikes that might be useful to browse through, the narration at the top may also be useful to you.