I think the concensus lately has been that there is essentially no difference between five Model 200's and one Model 755 (or seven 200's and one 770), as they all provide the same output. This is helped along by the fact that movies will generally not push all five channels to an extreme output level at once -- the one scenario where the separate power supplies of the 200's would be most beneficial.
If you are considering five 200's and the 950, you might want to look at the 950/755 combo. The 755 offers 200W per channel for five channels. If you plan to add two more channels later, you could add a pair of 200's later to drive your mains (which would let you turn the 755 off entirely for two-channel music listening).
Another thought -- what speakers are you using? If they are particularly efficient, you may not need any more power than the 100W per channel of the 7100.
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