Best strategy for my multi-site implementation?

I noticed that some themes (i.e. Blogs MU) are centered more towards marketing the chance to build your own site.

My goal is two-fold… While I definitely would like to offer hosting like this (and market it throughout), I also want my website to be an information resource FIRST.

How can I do that? Is there a way to have a regular blog-like website (content centric) and then have links to the hosting offering… and then when they follow those links, it takes them to pages focusing on the hosting offers? Is there a way to have TWO THEMES… one for the content/resource portion of my site, and one for the hosting offering?

Any recommendations on the best approach? Any lessons learned please?