KEF being a British company I am surprised they are not available in the UK.
But leaving that aside, I would choose the R2 as my first choice, and if the R2 are too expensive, I would choose the R3, and if the R3 are too expensive, I would choose the Q350 -- all as a better match than the Revel.
By the way, the Left and the Right speaker are not "effects speakers". They are where most of the music is reproduced in movie and TV soundtracks.
So the question is whether the Q350 are better than the Revel M16 at matching your center? You be the judge.
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