It will suffice since the Acoustechs will run off a boombox.
That's a very entry level receiver. I know it's been given high marks in some recent reviews, but I don't care for the power rating by the mfg.
Pioneer is inflating the numbers with a 1kHz rating at 1.0% thd. If those numbers were 20-20,000 Hz and .05% thd, you may be seeing a 60 watt receiver into two channels, and 25 watts into 7 channels. Mfg's do whatever they can to reach the holy grail mark of 100 watts - even if it's pulling the wool over consumers eyes. You won't see them do that with the Elite line of receivers. Educated buyers know better. That's why people come to forums - to learn.
The Acoustechs deserve a better unit than that IMHO. I'd say get the Acoustechs, and save up for the Pioneer 1015 (at minimum - they still inflate the wattage by higher than average thd), or a Yamaha RXV 1500 off Ubid.
I'm a big proponent of the weight of a class A/B amp in a receiver >= 33lbs. If the receiver doesn't weigh 33lbs, you probably aren't getting a quality power supply, and most likely small heat sinks. The size of the capacitors make a big difference, but if you don't start out with a quality transformer, and have a way to deal with heat, then you're starting off behind the 8 ball.
So whether or not you take my non-scientific advice about finding a quality surround receiver >= 33lbs, I think you've found some nice, efficient, attractive speakers that will serve you for a long time.