PW = good value, fun to mess with, but quality is hampered without some DIY effort/accessories.
Probably not a good match for the VR-1 in terms of quality or output. This is not to slam the PW, but to point out how good a reasonably priced small standmount can be and the sound of the VR-1 is very good. Adding a good sub (or two) would bring you to the very edge of state of the art sound. With the 90 dB/w/m efficiency of the VR-1, the PW would only reach about 101 dB in a 2,000 cu. ft. room (very loud for continous play, but not for peaks, especially coming off headphones). I did headphones for year in college and I know that it's very easy to play them too loud.
Expect lots of more consumer friendly digital amp options to be available by this fall. Currently everyone is waiting for the next generation of Panasonic receivers to hit the streets. Sharp and Sony are also in the fray.
A high quality, looksome, compact, good sounding 30 wpc integrated tube amp (with sub outputs available) would be the $800 Cayin TA-30:
http://www.2baudio.com/. The tubes are cheap to replace and it will accommodate lots of different types of tubes, even has an option for SET operation (although it's "heart" isn't really into it).
Hybrid integrated amps run from the 30 wpc Jolida JD-1301 for $350 and up. The 80 wpc Unison Unico is a beautiful piece for $1,500. Both can be modded. Check out
http://www.responseaudio.com/ and
http://www.underwoodhifi.com/The world is full of solid state integrateds. Creek, Rotel, and NAD are some of the better, lower cost options.