I run an entire system through a P10, including the powered subwoofers in my Vandersteen 5A's and a large stereo amp. Seems to provide an extra level of detail and resolution, or blacker background as someone else has noted. You can get a P10 easily for $3K, and I think it's worth it as a more or less final power solution.
Having said that, I also recommend that you have AC dedicated lines and run the P10 from one of those.
Having said that, I also recommend that you have AC dedicated lines and run the P10 from one of those.