Re:wholemeal pasta/brown rice vs white pasta and rice
The GI is a lot more than fibre. There are other consituents of food which affect the GI of that food, as well as the molecular weight of consituent macronutrients. Therefore NR is correct about what he says about brown basmati v white basmati rice - the GI are similar, but there is more fibre in he brown variety, there is also more B vits, especially niacin, and some minerals in the unpolished (brown) types.
Quinoa is a great low GI alternative to other low GI carbs - it is fibrous, though I do not know much about its micronutrition