OP
you must try!!!
I own the 707stand mount version and I know the B&W house sound. The B&W sound is like a "V" shape sound equalization. so be careful on the choice of Tube amp for the Midrange/Tweeters. Your Parasound can drive the woofers as Parasound has a lot of current drive that can handle the B&W' but if you want a Tube amp, then look into a 300B or PP Rogue Audio power amps. another amp to consider are Prima luna. the 300B will give you the sweetness that most tube lovers are looking for.
BUT beware, your PRE-AMO must be able to handle such a configuration. the ability to control independently the gain on each power amp is top priority.
good luck