On the assumption you really want a sensible answer most oil companies have a recommended oil for your bike, if you are a bit cleverer you can pick one using the Harley oil specifications and match them with an oil that meets or exceeds them, as for what brand is best, put on your hard hat, incoming :)
Standard Harley oil. better priced than most of the 'super' brands.
Bel-Ray V Twin in the engine
where are you buying the RedLine oil?
Yup.The old where do you get your red line from question?
Generally how often are others changing there oil. I do mine once a year as i do no where near the k's as per the book.