I've owned the Polk RTi series. I had the RTi8s. The 8s have better mid-range than the RTi10s. The CSi3 that I had was a very lacking center channel speaker. Not good with the dialogue at all. The CSi5 was too deep for my shelves, or I would have had that instead.
I'm now running the BIC (Acoustech) speakers in the front with my system. At 1/2 the price of the Polks, I still think the sound is better from the BICs. Many people overlook the BIC speakers because:
1) They are probably not sold locally by any of your audio shops.
2) Their cheap price keeps people from trying them because they think they are cheaply built speakers.
However, Paradigm has a great following. But, with their monitor line - and below, the cabinets are not even built out of MDF. MDF is a dirt cheap product, however, why doesn't Paradigm use it for their lower line?
Lastly, let your ears be the judge. Over the past 5 weeks or so, here's what I've had in my home:
- Polk RTi8, CSi3 speakers.
- Klipsch RF-35, RC-35 speakers.
- Axiom MTi22, VP150 speakers.
- Acoustech L, R and center speakers.
The Acoustech speakers are the ones I liked the best. They are what I've kept. They make my ears quite happy. When it comes to movie performance, the center channel speaker (at $119 or so) has very good dialogue. The speakers are very clear for home theater use and do an excellent job.
Just my .02