I do not post here much these days but just to let those with ranking woes know I have seen a change recently since all the trustrank come into the ranking sphere. I now see mega sites or trusted sites ranking on internals alone, which is a real first where we play. Going through the backlinks of some of the mega travel sites I see not one external link and them ranking for some money keywords. So IMO I definately see internals as a BIG factor if you have a big site with a load of trust. Go and experiment and I reckon if you have a good enough site you will see changes in 2 to 3 weeks.