Hello, I am looking for a pair of floorstanders which would cost around $350 each and they would work with a Sony STR-DB830 QS reciever.. I was looking at Paradigm Esprits v3 which are 400$ ea I think.. I'd prefer brands Klipsch or Paradigm but I don't really care about the brand unless it's White Van Scams Inc.

The size of the room is around 18m2 (aprox. 6mx3m). I mostly listen for rock and the balance of music/movies is around 75/25. It doesn't matter if an item is used or new.
After we find the right speakers, would someone tell me how to connect all the cables (unless it's front cable in front hole?) How do I know which cable is + and which one is -?
Thank you for your help!