Will leave for the moment others to explain their recc's.
As satisfied as you are with your positive synergy with your Energy/Pioneer experience, at least you can come back to it if, you try your 7s. Would decide then if you want to open at some point. A buyer may well want to buy unopened, but then again others will like to see and hear, inspect. Some value and desire for the center and the 7s remains.
The Energy Take 2 bookshelves from earlier I had and found those really decent. Klipsch has owned(?)that brand since 06.
Would keep the Pioneer then to power the Klipsch to see how they pair up together.
Care should be taken to not damage the new 7s as they are large and heavy, of course.
Just my take, so far.
BTW, would take pics of your factory sealed boxes as could use some later.