I really don' think that Polk Audio and B&W are in the same league, IMHO.
Try to get a better amp, usually the ones from the ridiculously priced lineups, and you will see (hear) that there is a night and day difference.
I have owned Polk Audio before and although a lot of people prefer a warmer high, as a result of a plastic tweeter, I don't like it at all.
Well, if you prefer a less bright sounding speaker, Polk Audio is the way to go.
But trust me, after a while of laid-back, non-fatiguing sound, you will actually find the Polk audio sound boring , lacking, and flat.