I've been checking out the Polk TL bookshelf series. The models are very similar with the exception of different tweeters and in the latter models, a larger mid-woofer. They seem to be price-protected with little or no discounts at TL1 $79/ea, TL2 $99/ea and the TL3 $149/ea. The packages provide a little savings but not much. Is the TL3 with its 1/2" larger woofer and ring radiator tweeter that much better? Anyone have prefferences.