Thanks everyone for replying!
- I will use 2 speakers. If I will get RF-7's, I will sell 280's.
-Then if I understand correctly: Main criteria at the price range ...-2K's is the power. Otherwize it is just a matter of taste pretty much. Thing is that I started to look around and there are lots of different receivers with much higher price (H/K 3770 was about 500 euros, aftermarket price 165 euros). That made me to think about the possibility that I could get more out from my speakers because why would anyone buy 2x...10x more expensive receivers than I have without gaining any real difference. Ofcourse I understand that there are audiophiles whos experiense and hearing is from another planet than mine. But I am sure that there are many guys like me who just want something a little better than stuff that they sell in the supermarkets.
As I understand: I have possibility to accept what I have or pay about 3-4K or more to hear any real difference. I can only imagine how much will it cost to get the maching 2x250W @ 8ohm for the RF7's. Otherwize I can test the aftermarket receivers and change them more often. For example I found Denon AVR-2809 (7.1) with the power of 135W @8ohm. Price is 150 euros. Receiver is located right under my TV so the absense of Spotify app or internet is not a problem.
Really nice to get so much feedback in just few days. Thanks! :)