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I have exactly the same situation, PR6 index, PR6 second level, PR 5 third level. I have been adding content every day since January 1st, and I'm hoping too that this month I'll get PR7. If not, the number of level two sections with PR6 will just grow and grow until I have a ludicrously large number - or a PR7. Also I'm hugging the PR7 sites in the directory, there's 20 or so PR6 sites and out of them I'm no 2. These days I'm not even seeking external links, I will at some time, but if Google gives me 2000 backlinks that come from within my own site, I'll get them first. They should in themselves be enough to get me a top ten position, and it means content and link building are done at the same time. I hope you get your PR7 man.
By the way, the No.1 SERP PR8 site for my keyword sells sponsored links on his site for $300 a month. I hear that's a good deal, right?
over and out,
Jeremy