Need Help Optimizing Existing Keywords

Digital Photo Software Development Company is looking for a SEO Professional with solid experience to optimize the existing pack of keyphases(~20). Keywords are related to photographer software products. We need to work with an expert which has a solid experience with: Forums, WordTracker, Overture, Google tools, NicheBot, etc. What we need: top 20 the most relevant for digital photo software keywords. This list can be arranged from : - New finding HHz keyword phrases - New finding LHz keyword phrases - By optimizing existing keywords I need you to tell me also exactly why these are good keywords and why they would works for us: and can be used with our site content, articles, PR, etc... Thanks,