IMHO, the SQ (sound quality) of your speakers is not as critical for HT as it is for music.
However, the point I would like to make is you are better served from a SQ perspective to buy a higher quality bookshelf (like the R100 or R300) than a lower quality floorstander (Q500 or Q700) for your budget.
This is especially true if you will use a subwoofer (which will cover any deeper bass provided by the foorstander).
One exception is if you have a very large room and like to crank the dog snot out of it. However a bookshelf speaker like the KEF R series are not too wimpy on that count.
If you just want towers because you like the look/image or they just make you feel good about your system; that is fine, just understand that it is not the best SQ option.
Either way, I would advise you to cut cost on (or skip entirely) the surrounds and get the best mains you can afford. The speakers are the most important item you put in your system and the mains are the most important speakers. I think you'd do better to buy a pair of R500's for $1900 and have an amazingly high quality 2.1 (or 2.2) HT than to buy 5 ea. of Debut or Q series. You can fill in the rest of the speakers later (but I would not spend R series dollars on them unless you are just flush with cash)!
If course, I used KEF as an example, but get whatever are the best pair of speakers to your ear.
Ok! I've had my say and will get off of the soapbox.
Hope this helps and, most importantly, it is ultimately about enjoying the art/emotion of the sound (music/HT)!
Thank you for the suggestion.
The R's are really out of reach. Its really the $1k for the Atmos toppers that does it. I priced out Refurbs even, and with the 6series Center Channel and Atmos Toppers, it puts everything out of reach.
I've also been told my receiver isn't powerful enough to run the R's, more money I'd need to spend in an extra stereo Amp/DAC.
I do think SQ is important, even for home theater. I prefer clarity over everything, not extreme loudness or DB's.
I also want the front to match aesthetically, not just sonically. I could drop the driver size to 5-1/4 or 5-1/2 if its better suited for my amp and overall SQ. If I could save there I could get a better sub to handle the lows the 5" drivers can't handle.
Musically I'm a midrange guy. I listen to a lot of aggressive music, punk rock, and classic rock. I don't need huge bass. One of the best setups in a car was 4 - 8" Cadence subs. Tight, crunchy, lots of punch, but not super loose and boomy.
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