
I have a pair of Equinoxes and a pair of Specialized Sub Zeroes. The Equinoxes are good for cool but dry weather and keep out the wind a reasonable bit too. They won't do you for sub-zero temperatures and they're a bit useless if it's properly wet, though.
On the other hand, the Sub Zeroes are unsurprisingly very good when it's really cold. They have a removeable fleece inner glove so they are good for quite a wide temperature range. The only thing I don't like about them is their lack of a Body Geometry palm-lump.
They are fairly expensive too but then I got them for Christmas. :-) I wore them while riding on some of the coldest nights this year (in town admittedly but it was still very cold) and my hands didn't get cold at all - in fact they ended up warming up!