dan, most of those gloves are fleece lined. which becomes totally useless (and cold) when wet.
i go for the real thing: Body Glove 3mm EX3 Gloves 1621 with reviews at scuba.com
climbing steel towers all day would destroy them in a coupla weeks, so another trick i used was to buy those cheap brown gloves from 7-11 or liquor stores for like 2.99, (like these: Gloves - Buckhorn Industrial, Inc.
) and wear them over the thinner warm water gloves.
sport chalet, REI, and other big sporting goods stores usually have a good selection.