Macadamias are about the best for carb to fat ratio, but they are extreamly expencive in alot of areas.

Peanuts are ok, if raw. You might get them in the shell to help control portion size as it takes time to crack them open. Make sure to weigh your portions as it is very hard to stop at 1oz.

Try a variety of other nuts as well. Almonds can eb a great addition to salads and stirfrys.

Some of my favorite meals include a salad with apples and walnuts or blueberries, and a stir fry I make which uses shrimp, broccoli, coconut and almonds. When ever I eat the stir fry I get a burst of energy and a warm feeling in the pit of my stomach.