best hanguard?

Bushwack brought up a interesting point in Voruzon's Ultimak Thread. the factory handguard is plastic and therefore an insulator. so, regarding heat dissipation, which after market hand guard is best in this area?

i've only seen two. the Choates handguard and the style that Greybear has on that cute little gun of his.

Greybear's is all metal, isn't it?

does anyone have the choates handguard?

i'd like to hear any input regarding both or any other handguard i haven't heard of.