Since I really have never messed with Guzzis much, they are pretty new to me, but the forums seem to indicate they are pretty trouble free. I've got over 3200 miles on mine new and other than a spark plug connector breaking, it's been trouble free.
the only thing mechanical I've had to do is adjust the valves, but with them hanging out in the breeze, it's not much of a challenge. Just old rockers with screw adjusters. gotta change a lot more places, engine, gearbox and rear end!
As for prices, they make a couple of cheaper models than the racer. They start at $8300. See the blurb in the latest Cycle World
Bare