I agree with Harry. No matter what you choose, even using identical speaker, it is impossible to get a seamless integration in a small room because the placement of the center is so different from the left and right speakers.
If you don't need to decode any new 7.1 format, I suggest a used Yamaha DSP-A1. It is probably 5 or 6 year old technology but it is surprisingly good sounding, reliable, flexible, and easy to use. It was listed for $2,400 when new, you can probably get one for $500 - $700 in the used market.
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