What are you going to do with 4? Surround sound home theater but without the center? (which is fine in most cases)
As far as amplification, I'd say anything in the 100 watt per channel or more range will easily do. I'm sure they're rated at a ridiculously high max power rating (given their size, driver configuration, and knowing CV), but that doesn't mean you need huge amounts of power to power them. CVs are actually pretty efficient speakers so you actually need less wattage to power them than a lot of speakers.
As someone that owned CVs back in the day, and whos girlfriend's sister owned a pair of 215s, know that CVs are very much quantity over quality. Cheap cabinets, minimal bracing (or zero in the case of their smaller speakers), cheap mids and tweeters, etc. If you're 20 years old and about to enter a fraternity, congratulations, you've made a great speaker choice! If you're almost anyone else, you might want to look around a little more.
How great of a deal are we talking here, if you don't mind my asking?
