i did the Phantom center in my room and loved it. i think the effectivness of the Phantom center depends on how optimized your room is for 2-channels. if you already have excellent center fill and depth then any center channel speaker will likely detract from the 2-channel performance and not contribute much for multichannel music performance. if you primarily watch movies then i would go for a center channel as dialog benefits from it.
how are you doing the center channel electronics? does your multi-channel preamp have that capability?
how are you doing the center channel electronics? does your multi-channel preamp have that capability?