I use a Convoy S2 which is brilliant, have a Lipo charger and a couple of extra batteries which I personally prefer to a torch with the light built into it as if you forget to charge you're not caught without a light... I also use one of these
SC600w Mk IV HI 18650 XHP35 Neutral White High Intensity Flashlight
although there really is little difference between the two.

I have a Cateye Rapid 3 as my rear although I'm not sure they still make them

If you have any interest in either of those and want advice on decent batteries / charger and the mount I use let me know