They are superb amps, but whether they would have synergy with WP7's, I do not know. That said, WP's tend to work very well with good tube amps.
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I ran AudioValve Challengers with W/P6s for a time and really enjoyed the combination. Plenty of power, nice soundstage and a rich, robust tonality.
It's really easy to roll the output tubes so you can have a lot of fun obsessing over which type or brand of tube suits you best. I ended up with Svetlana KT-88s. Wasn't too thrilled with the bordello color scheme, however. The W/P7s are a little more polite on the top end than the 6s but I think the Challengers would be a good match.
FWIW the Eclipse preamp is a very fine performer and is seriously underrated in my estimation.