Amp selection for someone on a modest budget...


I'm slowly upgrading my system on a modest budget and I'm looking to add a power amp next. I have Revel Performa3 F208 speakers that I'm looking to drive with this/these amp(s). I would like to get an amp(s) that I could keep if I upgrade to other speakers in the future but that isn't a deal breaker. My room is 14' deep and 30 feet wide. I listen at about 11' feet from the speakers. Future upgrades will include additional Performa3 speakers but this amp won't drive these. My current receiver is a Rotel RSX-1055 which I am also looking to upgrade in the future. New or very slightly used is preferred. Any help is appreciated! Thanks.
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The rest of my speakers are NHT including an NHT center channel, super zeros in the rear and an NHT sub. My budget for the amp is up to  $6ooo. I will be replacing the NHT speakers and sub with Revel  Performa3™ Series F206, C208, and B112 in the near future. My initial thought was to get an amp for the two front speakers and a separate amp later for the surrounds and center channel. I'm open to alternatives. Thanks again for your input!
Outlaw gets rave reviews as recently as the most current edition of Stereophile.   
For $6K, I'd stretch just a bit and shop for a used Pass 250.8 which would be super with the F208's.