I do the same type of riding as you do. I'm also 6', 240lbs and I love my TREK. I've got a midrange TREK and its light and easy to ride.
The new thing is 29" wheels instead of 26" wheels. The extra 3" larger wheel makes it much easier to roll over things. Test ride a 29er and see if you like it. Some guys really like it and some don't.
Riddler