If you wanted to move to https at a later date the process would be fairly simple. As WP stores the absolute URL in the database all you’d need to do is perform a find and replace on your database for http://www.domain.com and replace with https://www.domain.com.
That said, you should be aware that it’s best to use a script that accounts for URLs stored in serialised data. Something like David Coveney’s script would do the trick: http://davidcoveney.com/782/mysql-database-search-replace-with-serialized-php/
Is there a particular reason you don’t want to use comments? It seems like the logical solution. You don’t need to brand them as comments in the theme you could make it appear as pieces of “feedback” rather than comments.
