If your going to change often, every 2,500 miles or so.
VR1 sounds great (i havent used it but have read the UOAs), Also a 15/40 HDEO (Rotella, Delo LE 400, Mobile etc.)
Or ... if you bikes manual allows a 20/50 I just got a good report for my Vstar 1300 where viscosity didnt drop much using conventional Valvoline 20/50 motorcycle oil. First time I used it, wanted it for the summer, was so impressed with shifting, I just changed it again using the same.
After 2600 miles shifting was still fine, first time I ever felt that way. Its like $4. a quart in Walmart super centers or $5. in Auto stores and Amazon delivered free.
Since I do ride in winter at times when temps are above 60 (which happens quite a bit) I will still use my trusty 15/40 HDEO oils in the winter.
This is not to say just because I choose to use conventional oils and change frequently that I think that is the only way to do it. I would certainly try out the quality synthetics from Amsoil and Mobile 1. Im just not a fan of 5/40 synthetics, think its obvious that some of them have a good amount of viscosity improver that are broken down by the shared gear box.