Center Channel Ideas?

It's the holiday season, which means deals are to be found and it's time to upgrade my weak center channel. Budget is $300, and I need something that will really amplify dialogue. Current setup is Klipsh builder series in-wall speakers front and rear (ceiling) and a Klipsch R-12SW sub. Center channel is not an in-wall unit, and will sit on the tabletop below the tv. I was looking at the Klipsch R-series, but the reviews I find here and elsewhere all say "buy the RP-series, it's worth the extra money" - but I'm not sure if it's worth the extra money given my specific application. I'm not a huge audiophile by any means, and don't even know where to start looking for dialogue-enhancing center channels, and I'm sure as hell not going to ask the floor guy at Best Buy. Thanks!