Speakers to mate with a Krell Intergrated

I'm using Polk's, love the sound but a *bit* too polite. Was wondering if there was any obvious synergy out there with Krell intergrateds? What scares me most is losing the musical and rounded nature of the top end to finally get the kick in the mid-bass and low end. If I could somehow keep the top end performance of my LSi's and add more mid-bass, low end cohearence I'd be in heaven.

(Musical tastes, Radiohead, Massive Attack, White Stripes)