+1 the supreme is a great grip in the cold. its pretty thick and tacky. In the warmer months I prefer to use supergrap because of the bevel feel an its not as tacky.In winter, I usually use Gamma Supreme overgrip. It is soft and tacky. Also tried Wilson pro myself and I take Yonex over Wilson.
It seems that everyone has an opinion on overgrips, but the only one that matters is your own.
Last time I placed an order from Tennis Warehouse I bought Yonex, Wilson Pro, Gamma Supreme and Tourna. At about $4 per 3 pack it really is about the cheapest thing to experiment with. Buy a bunch and trade the ones you don't like to your hitting partners.