So many things to unpack here. For some generic statements:
Triangle vs Focal: That’s a personal preference thing. I prefer Focal sound. You might prefer Triangle. You should know what you prefer.
Chora vs Aria: The higher end speaker line always has less distortions, sound more detail with more realism. Usually, the higher end speaker line can also play louder. So as long as you can afford it, buy the higher end line within the same speaker brand
Floorstander vs Bookshelf: Within the same speaker line, a floorstander would always sound better than the bookshelf because the bass and midrange would have less distortions as you’re asking for the bookshelf woofer to do a lot more. This is especially true for large rooms or if you need or prefer the speakers to play loud. That said, I used to own bookshelf speakers and I was amazed how my ears can learn to ignore the midrange and low bass distortions but once I upgraded, looking back, I realized how much more distortions were there.
Now here’s where reality kicks in and exceptions to the rule occurs.
You have a fairly big room but if you have odd room acoustics or if your seating position is at a particular room node with a bass peak and you can’t move where you sit or if your speakers or subwoofer have to sit in specific spots and are not moveable, sometimes, you can find bookshelf speakers to be better than floorstanders. The reason for example is that if your seating position has a huge 40Hz bass peak and your bookshelf only goes down to 50Hz but your floorstander goes down to 30Hz, even without a subwoofer, you can imagine that the bookshelf is going to sound smooth from say 40Hz upwards whereas the floorstander is going to have a super annoying 40Hz bass peak. And with a subwoofer, you still can’t eliminate that bass peak for the floorstander but you can integrate the subwoofer with the bookshelf by rolling it off from 20-35Hz to not excite the bass peak and get good sound. You will still get more low bass distortions from say 50-70Hz with the bookshelf but it’s still better than hearing the annoying 40Hz peak with the floorstander. Btw, this happens way more often than you think, particular for people who swear by their bookshelf speakers.
The other thing to consider is this… You never mentioned whether your amp/pre/DAC is going to roll off the speakers or whether you plan on running the speakers full range. So let’s say you have a floorstander that goes down to about 37Hz. In a lucky room with great acoustics, you can just roll in your subwoofer from 20-37Hz and you’ll get fantastic clean sound. But let’s say because of room acoustics, your speakers actually extends into 25Hz because there is a slight bass peak from 25-37Hz but the 25Hz-60Hz bass is somewhat uneven. The challenge then is: how do you integrate the subwoofer with the floorstander? You can overlap the subwoofer from 20-60Hz to even out the bass but then you will blur the bass slightly as the floorstander and subwoofer bass would not match perfectly. Or you can integrate the subwoofer at 25Hz and live with the uneven low bass or you can choose something in-between. Now in the exact same scenario, if you own a bookshelf speaker that rolls off at 60Hz, you can just add the subwoofer as the SVS model you want has DSP so you should be able to program the subwoofer to have fairly even bass from 20-60Hz to integrate with the bookshelf speaker. Of course if your amp/pre/DAC can roll off the speakers with a crossover, you can get the floorstander and not have to worry about this scenario, except the additional crossover may not be completely transparent.
So my takeaway is:
1) Follow the general rules in choosing the speakers
2) If you already have a system setup and you’re upgrading, buy a microphone and measure what’s happening at your seating position in terms of room acoustics
3) Understand the potential exceptions to the rules based on what you measured
4) Don’t buy the subwoofer yet. Measure what’s happening with the new speakers first before making a decision on the subwoofer.
