Giro Zero CS, if they're still available. Very thin, lightweight and breathable. Not as fragile as they look, although a seam has begun to peel apart on mine -- which I could repair if I dug out my sewing machine or just a needle and thread. Only downside for folks with beef mitts is the Zero CS are pull-on only, no Velcro strap opening, so they're pretty snug. They add a little grip and sweat control with almost no padding, just a bit of thin reinforcing fabric.
A few months ago I paid a whopping five bucks for a pair of Adidas cycling gloves that turned out to be really good. Almost as lightweight as the Giro Zero CS, but with a more conventional opening and Velcro closure. Also a big snug. I usually wear medium but large fits me best in this glove. They aren't listed on the Adidas website but are available online for around $15 and in some stores. I bought them at Ross or Marshalls, discount/closeout apparel and housewares stores.