shadyj is suggesting power amps presuming you have an avr or pre/pro to use such with, do you have such a unit to use with a power amp? Or do you need an avr and a power amp, or wish to go with a pre-pro and power amp combo? Without knowing how loud you plan to listen, hard to make particular amp suggestions unless you're just wanting to play it safe with overkill on the power end. For modest listening levels I'd start with an avr with pre-outs then decide if adding a power amp was necessary.
Sticking with the same speaker line you're preferring for your mains (i.e. center) would probably be a good idea, but for surrounds may not matter a lot unless you're very into multi-ch music.
What is it about these speakers you found better than other choices? What did you audition?