Wright's own preamps match up brilliantly with his amps. The WPL12 would be a great match-up if you don't need a phono stage or his AU1000 (dealer-only) if you can find one. I've owned the 3.5's and have heard many of George's products (great stuff and a reasonable price). The lower output pre would simply necessitate your cranking the volume a bit more. The absolute quality of the sound is another matter entirely and is not necessarily related to a precise matching of output/input within .5V. If it is really far off I suppose it may bring in some noise and distortion.
Marco
Marco