Which Pure Audio Project Trio 15?

I'm considering a pair of the Pure Audio Project Trio 15's, but i'm unsure which centre driver i should choose. The Voxativ AC-X is above my pay grade, so that's out of the question.

I'm running a Gryphon Diablo 250w, streaming from an Auralic Aries S1 + PSU into a Holo May KTE.

I'd love to hear your thoughts and experiences on what you've heard, or are using.