Based on reputation alone, I’d go with the RSL. However, I’d recommend the bookshelf model rather than the LCR. Those often have “laser”-focused (aka “head in a vice”) soundstage, which I don’t care for. It’s easy enough to get stands for the bookshelf speakers. You’ve already heard the Polks, so you have a basis for comparison. RSL, like most internet vendors, offers a 30-day window for you to try them out, free return shipping if you don’t like them.
Regards,
Wayne A. Pflughaupt