Focal vs Dali speakers

as i should have indicated before, i'd actually opt for the focal cobalt (now discontinued, but widely available used for cheap) or electra, which have more seamless driver integration than the chorus.

the room is 600 ft, its large to me.

thats not large Bobrock. Still, a sub will benefit the situation. Though, placement will be important. You can probably experiment and get adequate bass performance. Try that, then see if you need a sub.

What speakers have a really good low-end?

I use a pair of FOCAL JMLab Nova Utopia Be which has preponderous bass and is superbly balanced across the entire audio spectrum. Incredible transparency and immediacy. Of course I am using Jadis JA200 monoblocks (tubed, KT88s) to drive these. Using a Jadis JP80MC preamp with only RCA inputs and no sub out. So I have a pair of XLR interconnects from my Audio aero Prestige SE CD player concurrently driving a Utopia active sub (with its own 1000 watt BASH solid state amp) to extend the lows below the foundation. I can not get the Utopia sub volume higher than a notch or two from zero for the right balance of ultra low-bass. The music can be seen, heard and felt.Talk of a moving experience!!!