White rice is far and away the best source of starch for glycogen loading in my experience.
Sweet potatoes and white potatoes come second, and bananas third.
White rice comes with the added benefit of zero detectable intolerance too.
F 5 ft 3. HW: 196 lbs. Primal SW (May 2011): 182 lbs (42% BF)... W June '12: 160 lbs (29% BF) (UK size 12, US size 8). GW: ~24% BF - have ditched the scales til I fit into a pair of UK size 10 bootcut jeans. Currently aligning towards 'The Perfect Health Diet' having swapped some fat for potatoes.