If your system is vinyl only, you might consider the Aesthetix Io. It's basically a high output phono amp with an attenuator so that it can be run directly into a power amp. I can't speak specifically to mating it with your amp, but I have heard it set up per the above and it sounded superb. I don't know if it offers any switching to allow the use of another source beyond a 'table, however.
Marty
Marty