I wonder what you, guys, think about how many keyword phrases (let's make it consist of two words, like "office chair") should be used at one page. Title can be no longer than 60 characters, so I fugure out it should be somwhere around 6 x keywords, or 3 2-word phrases.
optimize each page with one keyword/keypharase. max of 2 or 3 (give more emphasis on the #1 - most important) depending on the theme of the page.
just do one thing enlist all keywords according to your requirement and that make each page by targeting 2-3 keywords and make sure that keywords must be related so it can be targeted in one page.and which page have more competition keep that in title and which have less keep that in des.
just target on 2-4 keywords and make sure it's not more thank 60 characters in your title. put too many words are fine but it's better to focus on a lower no. of keywords. (it's all depend on your niche target keywords though)
I optimize pages for 2 to 6 . Or you may read this article on how to optimize site http://www.optimizewebsite.net/5_How_to_optimize_your_site_with_keywords.shtml