The CS10 and the CS20 are the Polk centers that are in the TSi Line.
Edit: Looking at the website the CS10 is the one that would match the 300s the best. I may actually try the 300s with a CS10 next week, as its one of the few setups I can try local and return if I don't like it.
its best to have all speaker up front the same size and from the same series so everything will be "timbre matched", but since you seem to want the biggest center possible i would go with the cs20, its drivers arnt the same size as your fronts but at least its in the same series
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