SEO for handful of landing pages

I have five domains (but up to 15 landing pages) that I would like to drive additional targeted natural search traffic to. The sites range from content aggregator sites to affiliate landing pages. The key metrics of success are: 1) natural search traffic from high rankings on targeted keywords (looking to go from ~300-500 natural search visits to 3,000+ per site per month) 2) traffic quality: keeping my conversion rate within 30% of its current rate Activities I'd like you to lead: > Link building on PR3+ sites including social media sites > Article marketing > Recommendations for minor changes to my sites if that will make an impact > Any other white-hat techniques that will drive long-term traffic Project timelines: I'd prefer gradual investment of your hours so that we can track success and tweak strategies as we go. I'm looking for your recommendation, but I had 2-3 months in my head.? Assuming success, we can renew the project and add additional sites to the list going forward. What I'm looking for: 1) Results-orientation: willing to take accountability for the goals above 2) Expertise: success doing SEO for other clients, with high client ratings 3) Proactivity: ability to take the lead 4) ROI: probably not too surprisingly, I'm looking to get incremental commissions and advertising revenue that goes above what I'm paying for the SEO work