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.