whatever speaker you get go for the best center you can afford.
i started with a bic venturi towers l/r and center in a 3.1 set up, i cant understand the dialogue, we hafta put the closed captioning on all the time.
bough ascends s2 for l/r and ascend sierra horizon center, we've never used the closed caption since then even british accent are easily understood.
Ascend Sierra Towers w/RAAL Left/Right, Ascend Horizon Center w/RAAL, Ascend Sierra 2 w/RAAL Surrounds, Outlaw Ultra X-12 (x2)
Denon X4200W, ATI 2005
Sony UBP X800