If you can afford it (the payments and the maintenance), get the Duc. The SV is inexpensive, dependable and kinda agile, but when i rode one, i felt like i was riding something inexpensive, dependable . . . kinda like my Mom's old Chevy. True it can be modded and made into a great track bike, but it sounds like you're looking for something for the street. I used to own a Duc 900 SS, which has a great deal in common with the Monster 900, and i never got tired of riding it or bored in the middle of a ride. What's the point of having a bike if it's not exciting to ride ??
One other point of interest . . . since Suzuki classified the SV as a "Sport Street" machine, insurance for my SV cost almost as much as the insurance for my Duc.