Interesting. What's your issue with the specific Polk's I mentioned. I've heard some of the lower end ones and aren't really a fan, but liked how they sounded on first listen.
This is the story: One bright day a few years ago I walked into big audio store and in one of the rooms they had all polk bookshelfs models available at time.
I listened to all of them starting from basic Monitor 40 thru LSi/9 and until I got to the last I ether a) hated the sound or b) was simply not impressed
It's the LSI/9 which played the best (by big margin) from the rest. However Polk prices them way out of most people reach and even refub LS/i models on ebay I seen go for 1/2 msrp are still overpriced imo
p.s: Paradigm makes some good speakers, but Atoms are not worth considerations for main speakers. I haven't heard the Altha's but people whom heard both Alpha and S30 were impressed with the later...
I still highly recommended to checkout Apperion Verus bookshelfs