1. Buying average isn't why you are on this forum. Good quality floor speakers would be what I would suggest and build from there.
2. Everyone has different opinions on what speakers they like. If you have the option, listen to them yourself. I haven't heard them so I won't vote either way.
3. Yes, the AVR should have no problem powering speakers.
4. Don't rush and plan carefully. Getting too excited is a personal fault