I wear regular long-finger bike gloves down to 40degF, then switch to plain old winter gloves below that. Those worked well down to 20F, which is as cold as I've ridden so far. I don't see the advantage of bike-specific gloves for very cold weather; I am able to work the shifters fine with those winter gloves on and they have plenty of padding. As long as they are wind proof and have good insulation, you should be fine.