Did I mention that my budget is not more than 500 bucks. Since all these receivers and many others are available around or below that range (from stores or the internet), they suffice my budget and to my listening needs.
I have listened to all of these, and currently listening to 5790. I did like the Pio 1014, its sound was more fuller and music very original. I did think the sound had more clarity (detailed)than the 5760 and the avr300 for that matter. I like the power of 5790, which I thought was lacking with the Pio to some extent. I think I am gonna decide amongst the 2 THX receivers.