My favorite do it all bike ...

The Scott Ransom 30 or 40, you could go with the 20, 10 or LTD but Scott did have some problems a while ago with the carbon Ransoms.

Lock out the rear and it climbs like a goat, switch to the 3.5" travel mode and engage the traction control and it climbs great over the rough stuff, switch to the 6.5" travel mode for your descent. The stock 30 or 40 comes in at 33 - 34 lbs.

There are some small quirks you need to pay attention to when setting the rear shock up and changing the travel and because of that there are a few negative reviews because riders do not pay attention.