First, I would divide out your budget. I would suggest the following:
1. 500-700 for an Avr
2. 1500-2000 for a very good, or maybe two, subs.
3. 2500 for speakers, with around 2000 for your front stage.
Brands? Well, that is very subjective and only you can decide what sounds good. I would look into the ascend acoustic Sierra towers. Btw, nothing wrong with the brands you are considering!