Tim, welcome. I don't have those Paradigms, but the numbers and reviews(e.g., in Perfect Vision) indicate that the Studio 100s and CC-570 are very well matched. There wouldn't appear to be justification for the added expense of the VP180 or CC690. There'd be no good reason to expect a wider center sound-stage, as the CC-570 with the tweeter and mid-range arrayed vertically appears to be excellent in that respect.

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Enjoy the music, not the equipment.