Mav I get your point, but the bikes I have suggested are trail bikes not works MX bikes.
I think we are all getting a little soft, at 17 my first bike was a TS 90, Susuki Trail bike, I toured all over the UK on it. In the 80's I did 4500km in six weeks on a KX 125 trail bike around Sumatra, Indonesia.
I agree that the 50 miles or so getting to the dirt would be better on the 800 or 12, but hey the fun when you get there will be worth it.
anyway onlt my 2 bobs worth.