Uh oh, another person who buys too much stuff on Parts Express!
I see on Newegg today, they've got a Pioneer 5.1 Receiver for $179/fs w/ promo code. I gave away my old 5.1 receiver and then afterward, wished I hadn't... Brilliant eh.
For my outdoor events, I have a pretty slick setup I came up with. I wired my speakers such that I can use the main HT receiver without moving it, and still get 7.1 outside. I bought a bunch of 6' extension cords, and cut them in two. Then, wired them up with banana plugs on the now cut ends. From there, I use my extension cords I have around the house and simply plug them into those 6' cords and I've got a speaker up to 100' from the receiver. 106 actually. It's simple, fast, and didn't cost a lot. And I don't have permanent stuff wired up outside. Not to imply this amp you show is permanent.
Then, we do movie nights or gaming nights outdoors. I have a 20' diagonal outdoor screen setup, and I simply project onto that.
Other than that, if I'm at home and outdoors, I'm probably mowing grass, or something else equally fun...