What speakers best do I need here

[hummingman]

Which speakers would best replace the four corner speakers in this room?
They are wired in behind the walls with the pictured cables to plug into an amplifier, which I also need to replace.
The wires connecting to the speakers themselves are two thin wires.
Thanks in advance

 

[hummingman]

I'm buying the house and the seller is taking the speakers and amp.