The boardmans are a nice bike for the money. I converted an oldish Orange hard tail into basically a boardman for my commute, haven't been out on it for a while, i use it as a trainer in the garage in the winter.
I too would recommend getting the bike fitted to your frame... And try and get away with the smallest / lightest frame, I'm 6ft and I've got a 19 inch frame, which is fine for mileage and commutes, but would prefer a smaller frame for technical MTB stuff, so you can throw it about easier.