Guys like Thurott and Pirillo and the others mentioned already are all good choices but I'd like to see you pick some new voices. The 'usual suspects' will almost certainly all get early access whether they're included in Team99 or not but picking someone
like PaoloM or, frankly, myself would be a positive step in developing new voices. I strongly suggest you resist the temptation to pick such well-known individuals. Except maybe
Mike Gunderloy, if you'd consider him very prominent.