I have really only done 2 things in this regards B..
1) Stick with my FJ ProDry socks. So far they have been warm enough, down to 45 degrees.
2) Get a pair of fleece socks. These are really warm, but your feet will sweat. I only use these in the really cold winter months, so no golfing experience. When I shovel snow, with lined boots, this fleece stuff keeps the tootsies toasty warm.