In reply to r.king:
Bit late to reply but I've had a Hope R4+ for about 4 years, doesn't cost that much more that a R2.
Can't fault it at all, it is really bright, has good battery life and the construction is bombproof. I also like the fact that it made in the UK and can be serviced/repaired as required (fingers crossed I don't need to try this out though!). I have a couple of Petzl headtorches, they are ok, but ultimately not that powerful and eventually the plastic breaks so they end up gaffa taped together.
I use the R4 on the road & mountain bikes with a 4 cell battery pack, and then with a 2 cell battery for fell running using the head torch attachment. With the 2 cell battery mounted on the head torch band it feels a little more cumbersome than a Petzl would, but you get used to this pretty quick, the alternative is to pop the battery into a pocket and use the extension lead which also works well.