Hi friends,
I want to let you know that my search is over. So in the battle BR5 vs IQ5, the winner is... RS6.

. I've finally decided for RS6. And I don't regret it at all. They are all that I wanted. Maybe a "problem" is that I don't have the complete system "by book"; thanks to
thevortex's comment, I took the decision to go in steps. After a few days of testing here are my thoughts:
AVR: Yamaha V663
Speakers: RS6 fronts /
RSCLR center /
No Sub / surrounds no names.
The Yamaha is a great receiver for both movies and music, it is perfect for what I needed.
Since my only worry was music, I think I would've been happy also without buying a matching center (I'm sure that another center could match - until this moment, after a few movies I can't say that the center made a big difference - at least not that much to justify paying the same price as for 1 pcs of RS6).
The fronts (and thank you
Venkat for insisting that I should stay with floorstanders), are great. For movies, it is possible to reroute the bass through fronts, and the kick they deliver is awsome. (In "The Fountain", close to the end, there is a scene where everything "implodes"- the sound literally hit me in the chest). I don't think I will go for separate Sub very soon.
My weak link are the surrounds, for which in any case I will not buy the RS1, but some nice and not expensive surround speakers (from Q1010 package), since the aren't that much solicited (in my case).
Thank you all for your comments.