Speaker ohm's?????

There is no such thing as an "8-ohm amp." For that matter, the nominal impedance of a speaker is just that--nominal. This is another example of how meaningless most quoted specs are. What would be more useful to know is what is the minimum resistance (measured in ohms) of your speakers, and how much power can your amp produce into that load. But even this tells you little, since power ratings are continuous and it's unlikely that the music you listen to contains continuous tones at precisely the frequency at which your speakers present the greatest challenge.

So stop reading spec sheets and just buy a good-sized amp that sounds ok with your speakers. If you start to hear distortion as you crank the volume up, you might need a bigger amp. Seriously, that's about the only way to know for sure.

I've heard the Concertos driven by a 100w/ch Yamaha integrated, and they sounded fine--in a somewhat larger room than you've got, probably. I imagine you could get away with 60w in a bedroom. Best to try things you can take back if they don't work.