It would be very useful.
I don't know of any site that does that - i go to pistolforum.com, lightfighter, m4carbine for a good idea of what's out there. Some of the big names do private classes as well if you contact them directly. I know Greg Ellifritz does classes on his own and for TDI, Robert Vogel does classes, as does Steve Fisher. Mad Duck Training is another good source.
Really, it depends on what you're after - tactical disneyland, shooting skills, medical, mindset/psychology of aggressors, etc..
You can't truly call yourself peaceful unless you are capable of great violence. If you're not capable of violence, you're not peaceful, you're harmless.