What dave said, defo dmr revolver and a freewheel like eno but if u want cheap, acs claw, (Y)
Wouldnt bother with a hope or anything, because its a pain when they do eventually go and need to send off wheel bla bla, revolver will not need to be fixed as all you do is change the freewheel for like 10 quid and its perfect for ages again!
I'll never go back :D