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You are very welcome, Daniel. Good luck to you!

Daniel, Did these responses answer your question? I'd also add that even with different IPs, you can still easily tip off the search engines to networks of sites, such as by using the same Google Analytics account. Check out http://spyonweb.com/ and see if it identifies that these blogs are linked.

Well, as with many things, there is a time and a place. Buddypress has very, very good uses. As far as mini sites the time was long ago! KW rich urls can be great but, internet users are getting savvy and they don't do as well as they used to for search or click through rates. Wish you the best!