Gravel kind of trails and very very light mountain trails, my Crosstrail can handle. But jumps or anything more, no. Going over rocks and I ruined the original wheel. Do jumps and you will ruin the simple suspension it has. Upgradeable, yes the Crosstrail is, boy did I upgrade mine. But it's not something I would jump or climb rocks with.

I like badger1 and others suggest a xc hardtail. Cannondale, Trek offer some really nice mountain bikes that are close to being a hybrid bike, but can handle what you are suggesting.

Example: Trek Marlin, Cannondale Trail.