Wall mount speakers suggestions?

Hello everyone I am new to this forum a few of my car buddies are on here and said I may be able to get some help on here. I am looking to purchase wall mountable speakers. I bought a denon avr-888 so that is what will be powering the speakers. I think the room is going to be hard to get good sound because of a it has high ceilings about 20 feet and the living room is all open leading into the kitchen/dinning room area. The reason I want to go with wall mounted speakers is b/c I am trying to keep the room looking simple and clean. It has a little room built that I call the central command room where all the electronics go.

I am not looking to go crazy on the amount of money I am spending because the house has a theater room that is built, wired but has no componets so I am saving my money for higher end stuff for that room.

Any suggestions, links, would be great.

Thank you

Sorry about that. I don't want to spend more then 600 for the speakers and sub. I also forgot to put down that I am looking for a 5.1 surround sound.