Welcome to the Axiom forum Chicagojmw.
The W22/W150/QS8/EP500 is an excellent choice! This should provide you with plenty "wow" factor. Any of the modern 7.1 recievers these days should have a zone 2 capability which would allow you to power a 5.1 system along with your outdoor speakers. I have never used the zone 2 capability but I believe you would have to install the speaker wire hooked up to the outdoor speakers to the surround back speaker terminals of the receiver and change the settings in the menu of the receiver accordingly so it is setup for 5.1+zone 2 instead of 7.1.
