The three speaker companies are solid middle road products and your receiver should be perfectly adequate driving them. Klipsh is probably the easiest of the lot to drive as it is the most sensitive. In other words it will play a lot louder with less watts than the others.

Klipsh is not for everyone but horns are typically faster sounding but can also sound harder. It's a matter of taste...you eithe rlike the horn sound or you don't. Klipsh's Reference series is the way i would go if you can afford to...a good solid punch in the bass response helps them out too if you like rock music. The Studio series from Paradigm is the only series worth looking at iMO and they are fairly costly - far too costly if you're in the US paying US prices. In Canada at par they're much better.

Also look into B&W and Energy