Hi,

I agree that Semantic MediaWiki is the right choice here. Let me just note two additional extensions that might be helpful here:

Semantic Internal Objects lets you store compound/n-ary, of the kind that you find in tables (each row is its own "internal object")

http://www.mediawiki.org/wiki/Extension:Semantic_Internal_Objects

Semantic Forms lets you create forms to create and edit pages that store data via templates:

http://www.mediawiki.org/wiki/Extension:Semantic_Forms

I should note that I wrote both of these extensions, so I may be biased... but other people do use them.

-Yaron