I bought a pair of Paradigm 9SEs (now Monitor 9s) for the price of the 7SEs. It was their last pair and I guess they wanted the space for the new ones. This was 18+ years ago and I matched up the centers and rears also with Paradigm. I have a Yamaha 2095 powering them and have been very happy with this setup. I've had people think I'm running a sub somewhere when watching movies!

This was when Paradigm was receiving rave reviews for great sound for the price. As sleddriver mentioned, don't know about nowadays. MBQuart used be a great speaker for car audio, but have heard they were bought out and went downhill. True? Seems to happen often, though.
I took in some CDs to give them a listen. Made sure they had them running JUST through a comparable receiver and just...listened. Quality sound becomes, I think, a bit on the subjective side. If you REALLY like the way a set sounds (after REALLY listening), the way they sound becomes the norm. This has been what I experienced with my 9SEs. I know when I play something through them I'll enjoy it.