Which AV Receiver?

Hi,

I have a pair of Klipsch RP-8000F floorstanding speakers.
I am a little unclear about what I need to complete my setup.
I want to use these as home theatre speakers when watching Netflix or Satellite TV, and also as music speakers when playing off Spotify through the TV or via iPhone. 

The guys in the Amp forum recommended an AV Receiver but I don’t know anything about AV Receivers.
Are they able to power the speakers and bring out the best in them? I heard Denon, Onkyo, Marantz, are all good brands. Perhaps you can suggest a few models ranging from 300-1000 in price. 

I need enough channels to add in a sub (I have Klipsch R-12SW) and potentially a center speaker (yet to buy but probably will get the Klipsch RP-504C) at a later stage. 
I am a newbie to all of this so willing to learn, please forgive my lack of knowledge.

If you need more information please let me know. 
Many thanks in advance!