If you don't want to cool the 2080TI, you don't need to of course.
But if you go overkill, you might as well watercool it :-) And you card will max out boostclocks on water. And you don't need to afraid of leaks with softtubing. It's a lot more secure than hardtubing.
The Lian Li V3000 is a super nice case. Put 1 rad in the bottom and 1 in the top, so they both get fresh air. A second radiator doesn't a lot of extra cooling if you feed it with warm air from the first radiator, so that's why the V3000 is excellent for watercooling. I flipped my top exhaust to intake on my Define R6 and I got a lot better temps, but the airflow dropped a bit because I have 6 intakes now and 1 exhaust. I always found the Caselabs cases too big, but the V3000 looks perfect!
Bitspower fittings are fine. You can't go wrong with them.
The SR2 radiators that your updated list are also very good for low fan speeds. Just make sure they fit because they are 60mm thick. Other than that, good choice.
And I see you're going to do dual pump, nice!
I have 1 more suggestion for you and that's Aquaero 6 LT and a water sensor. The Aquaero allows you too cool the loop by watertemp or Delta T. This means that the fans will only spin once the water gets warm. I have one and I don't use fan curves, I a target of 8°C Delta T and the controller choses the fan speed to keep this delta. Under idle my fans are spinning super slow and depending on the heat dumped into the loop the controller accelerates the fans to keep this delta.
Other than that, I have no more comments. You'll have a super nice system!