I'm using the Reebok version of Under Armor shorts and long sleeve top. It doesn't bunch up under the wetsuit, it provides good UV protection, and it was cheaper than buying actual dive skins. Around here quite a few sporting goods places are clearancing out their warm weather lycra stuff to make way for the cold weather gear.
The only complaint I have is that the lycra top does retain more water than just your skin would and, unlike your skin, you can't towel dry it completely. Not a big deal... it's only noticeable if it's cool/windy and it dries quickly.
Jason