You might keep in mind that in Denver and other "..places of altitude.." it takes 1000cc's to equal what you get from a 750+ in San Diego; especially when riding 2-up.
Some of the Honda and clone "4's" in the 400+ range are really good commuters for rider-only situations. Good tire width helps a lot regarding stability.
John
Park your Sub at the iHub - Bub; .....the experience might just "...float your boat..." !!!
.......According to the Great Pumpkin, ".....You're in .....iHub....., Charlie Brown....."!!!