I just googled and read up on the Clearwave speakers that you are going with. They seem to be a very strong combination of drivers, but, I think that they will fall well short of the Ascend Sierra and Horizon combination, especially if you were going with the upgraded Raal version.
Those Dayton woofers are pretty good, and I have heard them used in another design, as well as the Tang Band mids, but the mid and woofers used in the Sierra's are of higher quality.
I can not recall hearing that specific Scan Speak tweeter, and while I have heard plenty of SS tweeters in the past , and can honestly say the ones I have experienced are excellent, they are, however, no match to the Raal's.
The Raal, when implemented properly, is one of the best tweeters on the market for detail, accuracy, transparency, and has the most sparkling top ends of just about anything out there.
Now whether the differences between the Clearwaves and the Ascends are worth the price difference, that is only something that you can decide. If it were me, I would go with the Ascends. There honestly isn't anything in this price range that will beat them for the kind of music that I listen to, and if I wouldn't have gone for them, I would forever be wondering; what if? If you can't swing the $4,400 to buy the Sierra and Horizon combo, you can get the next best thing in the Sierra 2 for your LCR with enough money leftover for a nice pair of subs, and possibly some change in your pocket!