I layer a pair of wool mitts/gloves ($10cdn) (the kind that have fingers exposed but have an attached flippy part to pull over when the fingers get cold) over a pair of North Face thin gloves intented for rock climbing ($40cdn). This way I still have dexterity when it is cold out and I need to fiddle and I can moderate the temperature of my hands by flipping the wool mitt part over my fingers when they are cold or vice versa when they are hot.

I hope this makes sense. Sorry for the technical use of "flippy part".