Here's a glove option that I discovered by accident. Wear silk glove liners under your regular (short-fingered) cycling gloves. Dirt cheap and works to surprisingly low temperatures, easily down to 45 F for me.

http://www.amazon.com/gp/product/B00...ms_ohs_product

They are a little slippery on grip, but that hasn't bothered me much. Your fingers may feel a little cold at the start of a ride, but once I get going this combo works well.