EAD Powermaster-2000 or Powermaster-1000

Has anyone auditioned the EAD Powermaster-2000 (400w x 5 ch) with the Powermaster-1000 (200w x 5 ch)? Is there any difference in sound quality? Outside of shear power do they sound the same?
My HT setup could probably only use the 400w on the front speakers (speaker's spec says 300w max). Center and rears don't need more than 200 (and even that is alot for the rears). Speakers are Mirage:
front- M-3si's; center- MC-si; rear- MBS-2's; sub BPSS-210 (self powered).

Have EAD Theatermaster Ovation and will be upgrading to Signature-8. Most of my listening is 2 channel stereo. Room itself is not large (16x14 with another 4 feet behind the M-3si's), but it is only partially divided from another space behind that is twice as long (16x30) making the entire room 16x45 with 9 foot ceilings). 200 - 250 solid state watts have seemed sufficient power in the past to fill the space.

Would there be a big sacrifice in sound quality by going with the 200w Powermaster 1000 instead of the Powermaster 2000? Is it either irrelevant for the for the speakers, or undesirable due to the power capacity of the rears/center, or would I be missing out on my 2-channel listening without the extra power of the 400w model?

Any comments, information, suggestions, etc. on this would be appreciated.