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I also do quite similar - on the base of the same pages as above - where I link the main info (in my case travel regions) as well. And the link back to the sitemap.
I also link out to clients pages from relative pages with a link back of course - using the same key terms.
So to me it is more about ease of using the site than numbers. If it easy and works for the site user G doesn't penalise it (so far)!
Our PR is medium - but SERPs are fantastic... so to me PR is less of an issue - increasing traffic is my priority!
/Wayne
"Keep the links on a given page to a reasonable number (fewer than 100)."