Which would you get (and WHY?)

[WildKat]

So based on that information only, which do you think sounds better (not just based on price, but all around)?

Just based on what you posted up I'd say the Busa is the better option..not because it's a better bike but you know more of the history of it. If it were me I'd go with an R1 over a Busa more than likely because it's just a phenomenal machine as you mentioned. The one you are looking at could be a great buy but if the dude can't produce documention on the history and maintenance on it, man I don't know...