If you don't need a lot of SPL, check out the Art Audio line. I have used their 13 watt Diavolo and 16 watt Carissa Signature on my Maggie 3.6's but they have a pretty flat impedance curve which SET's love. Their standard and high current version of their Jota has even more power and current which might be the best for your WP7s. SET may not be everyone's cup of tea but I think everyone should try it once in their lives. It's just essential that in doing so the amp is happy with the speaker. They do make more powerful PP's if you need to go to "11".