- one of the problems with brand specific forums like this one, is you tend to get, "group think" where everyone pretty much has the same idea on their brand and pity the fool who dares question or have an opinion contrary to the "group."
Tis a shame really as there are many fine folks here with much insightful knowledge but as a whole, you wont get much beyond "buy a BMW...yadda yadda yadda..!" here.
The same will be said on any Brand specific forum, KTM, Yamaha, Honda, etc...
Best bet is to go somewhere like the WERA forums (not for the weak knee'd as they can chew up and spit out imposters pretty fast) or a general Sport bike forum covering no brand specifically.
That said, I'd go with with the Duke for the Street as in reality today's Sport/Super bikes make poor street bike choices. (Yes that's my opinion and that of the R&D engineers who design them.) I venture as you mature as a rider you will find its nuances more enjoyable on the street vs primarily using the R1 for the street.
Man, I must be getting old...