So far I failed to find a waterproof glove that is not too warm, so my hands will not sweat. I have some ski Gore Tex gloves that are waterproof but too warm for cold rain riding, they are fine in freezing temperatures.
I just purchased a size larger thin leather work glove(shell, no liner) at Lowe's and "waterproofed" them with mink oil. I am planning to wear them with thin wool or fleece glove liners or without depending on temp.. It is not too bulky, waterproof, breathable and flexible to control the temperature. Hasn't rained yet though.