Much of it depends on the size and shape of the room and the acoustics of everything therein based upon type of flooring and furniture which can bounce/reflect or absorb sound.
You'd be best to post this in the AVR section of the forum but there are so many factors that can be a budget level of a few hundred bottom of the rung HTIB or it could running into the tens of thousands. I have an Elite receiver feeding three HDMI and one out and have plenty of kick to it with a screaming wife to turn it down and I do not even recall my wattage as I rarely get to take it up to it's potential.
So much of what you suggest depends of variables that differ from one's budget, and other variables I mentioned. Total wattage also is something that's overhyped by many manufacturers. A HK AVR may spec lower but in reality kicks out more than many with higher wattage ratings as an example.
I really love the sound of my fairly new Elite receiver but I hate the remote as the friggin thing is so complicated it seems an MIT grad would have a challenge with this thing. I prefer to keep it simple and refrain from delving into many areas of the remote as I troubleshoot and manage a network all day and I hate bothering with it when I get home.
Visit the AVR threads and post your personal variables, budget and goals as to what your trying to achieve to try and make a match with a likeminded person that's already done the hard work for you! Good Luck!