313304 stamp site seo work

I am looking for someone to help improve the search engine optimisation for the following - [login to view URL] site. This can be by any method deemed suitable, but ideally i would like the cost to be reflected by the effectiveness of the seo campaign. keywords we would like improved search engine placement on are as follows - rare stamps stamp dealers stanley gibbons stamp auctions stamp expertising stamp expertizing philatelists stamp investment alternative investments Would be interested to hear from experienced seo people with a proven track record.