Hi,
I have the Rotel A11 Tribute you are considering, but haven't heard the other two amps, although the Rego Brio is super popular amongst AVForums members. I really enjoy the Rotel, having tried a few others, I have settled with this one for now. It provides a nice blend of smoothness and clarity, but is a little light on the bass. The bass sounds well formed and natural, but it seems to play it down just a little in terms of bass weight and slam. Rotel is probably aware of this, and have included several built-in EQ options to boost the bass. I never use them personally. What you get is a beautiful soundstage, nice imaging, and plenty of detail and a smooth, natural, effortless delivery (at least to me and for the price). They didn't change the built-in phono preamp, so it is the same as the old Rotel A11. Sounds fine to me though. I imagine the Rega Brio may be better though. Oh, one more thing...the A11 Tribute is rated at 50w by Rotel, but an independent test put it at 78w per channel into 8 Ohms continuous, with peaks up to nearly 120w per channel. In other words, its a lot more powerful than the specs show. It has a funny volume meter, and is very quiet below 40%, but after that it begins to come into full force. I generally keep it around 50-60. I spoke to Rotel about my concerns about turning an amp up to 60% to get a good listening volume and they said not to worry. The number on the dial isn't percentage of the amp's power being used. Even at 75 and up, there is still plenty left in reserve. Although they don't recommend long periods of play at levels much higher than this. I can honestly say that with the Bronze 5s, at 75 on the dial, it would be freaking loud.
To me, the Rotel may not pair well with Klipsch speakers. I haven't tried the combo, but, at least to me, the Rotel pairs better with smoother speakers, like the Q Acoustics 3050i. Klipsch are known for being pretty "rock and roll", very exciting and lively, even bright or harsh. It is a matter of personal taste though. If you like that kind of sound, then it may work for you. Probably sounds great with heavy metal and punk, etc, but I don't listen to these genres, so have no idea. I like to relax when I listen. Exciting speakers paired with the Rotel can be a bit too much for me. I am a fan of Monitor Audio speakers myself. They have a reputation for being a bit bright, although I have not experienced this myself. I confess to only having tried the Bronze ranges. Maybe the silver or gold ranges are more lively.
Hope that helps
Good luck with choosing a new system.