Hey Mr P.,
I myself am running the 990/7125 combo w/ ref studio 60's/v3 for mains and cc-570v3 for center. I have them set up as small w/ the crossover @ 40Hz for both. But some times i have change the mains to 'large' for 2-channel.
I love the sound and i don't find myself asking for more.
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later,
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Outlaw 990/7125, Oppo, Xbox 360, Paradigm (L/R/C), Polk (S), M&K Sub w/ SMS-1, Samsung LED-DLP HDTV, Signal Cable, Brickwall