I am new here and I am a little embarassed to say this but I am a very large guy (6'1" 280 pounds) and I am interested in a mountain bike. I don't have much money ($300 american) I am probably going to buy a KHS Alite 500. Will this bike hold up? Should I look for anything in particular so I don't destroy it the first time I take it off road? I mostly want it to ride to work and on logging roads near my home in the evening. I love the mountains and figure this would be a good way to enjoy them and loose some weight. Thanks for your suggestions.