Thanks for everybody's suggestions.

I should have added more info about my setup. I'm currently pushing the 1.6s with a BK ST-140 amp, which supplies about 105 wpc into 8 ohms (no stats on 4 ohms). For quieter music folk, jazz, solo piano), it's fantastic, but it seems underpowered for certain "busier" music, for lack of a better word. I lose that wonderful maggie clarity and spaciousness. So, how much of a jump in power do I need to hear a noticeable difference. Something like the NAD C372?

Thanks again, Gary