I used to do twisties. Now I scoot over to the gym and back and run errands occasionally.
Used to, now in Oakland (Piedmont actually). But with kids... you always have an errand or two while you are out and dragging 4 gallons of milk back on a motorcycle is a pain.
I actually have never cared about engine noise. I like the open-air motoring. To be honest, I sometimes prefer road cycling because you can hear nature. So if I could get a silent motorcycle, it wouldn't be a bad thing.
I've got just the ticket for you. Warning: Spoiler! (Click to show)
Seriously though I see a Thruxton R, a 800 Brutale RR or a Striple R serving you much better than the HP4.