I have the 360 RGB. I pulled off the Vardar fans and replaced them with Phanteks T30-120. Much quieter and moves more air and cools really well. Have had it over a year with no issue. Run the pump at 70%.
If you run your CPU hot a lot, I found thermal Grizzly pumps out and dries up and your temperatures start to rise. It is very good other than this.
Noctua NT-H2 paste is very good. It is what I am using now. I have an aio and my idle temeperatures are < 1c above ambient room temperature.
While It is true that Fractal stock fans aren't that great (they aren't garbage though, that is just exaggeration- mine are sitting in a boxthough). I have had Noctua case fans in my Fractal Design Meshify 2 case with an nh-d15 and also with a EK-AIO 360 AIO that easily beats the Noctua and...
Same with Meshify 2 and Meshify 2 XL - according to your leaning.
I think a lot of mid-size cases are more compatible with a 240 and 360 rather than 280 or 420 - due to memory clearance - they would need to be extra wide to accommodate 140mm fan/radiator width.
I went from a 1070 to Asus 2070 Super Advanced because I wanted to game 1440p. Well worth it. I went from arounfd45 fps to 80 fps smaat2x in SOTR. Caan ray-trace medium with smaat2x in same game at 72 fps average.
My guess is it was the cheap connector on the extension cable in this case. Resistance in the connector heated it up eventually causing the connector to fail and short-out, resulting in a large current flowing through the wire and melting the insulation. Extensions on such high current cables...
You might also look at the 14Ds. It has one fan, but there is little difference in cooling. And it is cheaper and has better clearances.
Good move in either case.
Never heard of a RGB version. Doesn't seem like a Noctua thing.