I have heard all 3 amps, and all are fine sounding. The Bryston is a step above, sound and build wise, but to me it's overpriced, especially if you can get the Rotel on sale. I might have a different answer if you had Maggies or Vandys to drive.
I would reserve some funds on the sub, if you're going that way. I would spend more on the sub than the amp. A musical sub is a quantum step above a mediocre one. When you buy a sub (or better stereo subs) you are also buying an amp! I have bought several cheap subs in the past and always regretted it.
This is off topic, but consider borrowing a TUBE preamp or integrated, to try at home, if you are like me, you will never go back. A good tube preamp brings music to life.