outdoor speakers/sub recommendations

Hi:

I already have 2 Niles speakers that are going on the back wall of my home for my new patio. I'm looking to run 2 more speakers to the back of the patio along with a sub. Any suggestions for in ground speakers and sub? Also, do you think I'll need a speaker selector box off of my Amplifier for 4 speakers and a sub? If so, any suggestions?

thanks in advance!