Get a scale that measures percentage body fat as well as weight. My weight loss has plateaued but my waist keeps shrinking and my body fat percentage keeps declining. My percentage body fat is down to 19.5%, in the "fit" range for a guy my age. Atkins talks about this in his book. Fat is less dense than protein/muscle. So you can lose fat and not lose weight or even lose fat and gain weight.
Also, don't forget that Atkins boosts energy tremendously, and eliminates the energy swings associated with changes in blood sugar.
I've seen these scales in sporting goods stores. I just assumed it was a gimmick to sell the scales for more money. Are these scales accurate? How do they figure out body fat? Are they worth the extra money?