I currently have a Giant Defy 3 Road Bike, I enjoyed it for awhile, but I am 6'4" floating around 300lbs and this makes a road bike impossible for a daily ride. I'm looking for something to be riding to work regularly, to either trade my road bike or buy with the money I get from selling it. Now my question to yall is, would it be worth even looking at a Diamondback or Nishaki(something liek that) from Dicks sporting goods, or would I be better off buying a Trek/Specialized esque brand off of craigslist or maybe a entry level model from a bike shop(what will something like that range? I'm looking for something reliable to ride 6 miles to a from work gradually working up to 5 days a week. Thanks!