Do the surrounds really need much power

It depends on what surround format your using. Dolby Pro Logic doesn't send much info to the surrounds and the surrounds are also bandwidth limited. Dolby Digital, DTS, etc... all have full bandwidth to every speaker with a greater amount of info also. Plan ahead and get what you need now so that you won't be going through this again in a few months. Sean
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See my post on the other thread you started Robedk for my experience.

It should be true ,but with the power craziest I see ,I doubt it now....more power more power.....

Yes, the Dolby Digital, DTS etc. will have the surround channels as separate discrete channels where they can definitely use the full bandwidth.  However, movies are not mixed this way.  You will not actually have a lot of sound output on the surround channels, even during heavy action scenes.  There might be one or two scenes here and there that may use more impact on surround, but for the most part, there is actually very little sound level coming out of side/rear surrounds.  You can definitely get away with smaller power amps.