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!
laher
Come to think of it, however, my guess that the NAD may be a bit bright may be off-base, if the 758 is a class AB amp as opposed to the more recent class D NAD amps that had the reputation of some brightness.

Like I said, I haven’t heard the 758 so I’m only making educated guesses.

To be honest, I would have seriously considered the 758 a year ago when I got my SR5012 on clearance, but it was almost 3x the cost so I went the cheaper route and didn’t spend too much time considering the 758 because at that time I didn’t want to spend $1500 or $1800 or whatever it was on my AVR.  My budget at time was also $1k, just got lucky that $1k SR5012 went on clearance for $600 at just the right time.
Thanks kren0006, really appreciate you taking the time to give your input. 
That forum is quite interesting, they talk about Dirac being better than Audyssey  I’m in a Klipsch forum too and few have spoken highly of the NAD over the Marantz too. 
After what you said about NAD’s, I am concerned about the potential for the 758 to sound too bright as this is definitely not what I want. I’m not able to test this out in any shop, so without finding someone who has heard the 758 it’s a bit of a risk right?
The amp in the 758 is a class AB for certain? And this does not produce a bright sound?

Having BluOS is definitely a plus by the sounds of it. You mentioned the DAC in the 758 is old, but do you know if it is mid level?

You mention that the NAD and the Marantz are old, is there a newer better model of each?
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