Faced the same dilema and could probably write an essay on it, but in the end I bought a 2010 5AM from Biketreks. Stuck Sunline V1 stem and 745 bars on and swapped out contis for some stiky Maxxis and went for £180 Hope X Tech brake upgrade (look good but as yet are crap)
I'm 15 stone and ride DH hard, previously rode a 40lb Marin Quake everywhere from Scot, Welsh trail centres to French Alps and can't imagine you would need anything more than this for UK trails, will reserve comment on how it fairs down the Pleney and Chatel but expect it will hold up!