So.... I have interviewed the Ascend Acoustics sierra towers in my own home against another speaker system about 3 years ago. The Sierra Towers gor sent back but they were picked as just one of 2 systems I was interested in. If your budget is 3 to 5k, I would absolutely go that route. They are wonderful speakers but you will need a good subwoofer (s) to go with them as the base is the weak spot against others; and don't let the Ascend fan boys impress you with all of their graphs and measurements and all on that last point. They are a loyal bunch and anyone who says anything negative about this $2700 speaker is a heretic. So again, this is a good choice.
That being said, I have since moved out of this price range and into a completely different world. And I do mean..... wow, huge difference. At 96DB sensitivity my Legacy focus XD speakers are unbelievable. (no subs needed for sure). The ribbon tweeters in this system are mind blowing. I think you would be happy also with the SE version (without built in woofer amplification) and the Legacy signature (the little sister to this speaker that I have also spent some time with, just before stepping up to the XD..... just because I could). As to the rest mentioned in this thread. I have heard none of them so check them out also. Good luck