One caution re tubular steps
I just wanted to post my experiences in regard to tubular step bars, since I see the '06 sport model now has them.
I previously had an '02 Tundra, and added aftermarket step tubes (Manik), and the things were simply a MAGNET for crud in the winter. The snow and ice kicked up from the front wheels would get lodged between the tubes and the frame/body, and there it would stay until the next thaw.
My '05 sport 4Runner on the other hand has running boards, which work MUCH better in the winter (here in Minnesota). Sure, the crud still collects, but much less, and only on the bottom of the running boards, as opposed to all over the step tubes.
Lesson learned: the tubes look cool, but if you live in a cold climate with snow, running boards simply work better.