Matching components to Speakers??

I agree, you can use the specs to narrow the choices. Five (or more) identical speakers would be the ideal for surround, but is isn't usually a practical solution. Two speakers is enough for me too!.

I too can't imagine that you'll ever send 200 watts to a surround!
But more to the point, start by getting the sensitivity ratings of the speakers you're auditioning. If they're near the norm of 88dB/w, and not too low an impedence, than they'll require far less power than some small 84dB/w monitors, for example. If you very efficient (90+ dB/w) peakers your power needs would be correspondingly less.
Factor in liveliness of room acoustics and listening levels, and you should be able to make intelligent choices.
I find that 60w/ch x5 with my NAD T751 into 88dB/w Spendors and Boston surrounds is much more than I need, if a good sub is used, for example. And do remember that it's the first few watts that matter the most, and that most of the power is required for low frequencies, so using a good sub will definitely reduce your requirement for hefty amps.
Good luck.

Make sure you get really good center speaker,it is the most important piece in your HT system.Mike

With all due respect to Mikedimitrov, many feel the most important thing about the center channel, is remembering to shut it off.