I'll not mention the cloudiness issue other than to say my flexible tubing is still crystal clear after 2 years. I guess it varies depending on the manufacturer and the coolant you're using.
Before thinking about hardline, read up about how you fit it. It is a whole lot harder to fit than flexible tubing. With flex you guess the right length, cut it flush, screw in your fittings in, stick the tubing on and then tighten everything up. With hardline you have to be much more accurate with the measurements. Unless you use a lot of fittings to let you just use straight tubing you will also have to make all the bends with a heat gun and a bending insert.
If you're happy to make the effort, it looks a lot nicer than flexible tubing IMO, but it's a lot of work.
this. plus no matter what anyone says, taking apart a rigid tubing loop for maintenance is more difficult. I know some will say it isn't, but with flexible, you can literally drain down with your drain port, then unscrew fittings and know if there's any water in there, you can bend it straight down out of the case or toward a bottle to take the remaining water.
with rigid tubing, this is not the case. you have to be way more careful.
I wish my camera did the loops above justice, they look much more subtle IRL but sadly, for some reason, my camera amplifies brightness about 10x more than it really is (exposure? no idea.. crap with photography)
the 240 upright was really 'just for looks', in the previous setup was 360 top 360 bottom 240 back but.. if you're using 2x 480 then in the enthoo it'll be a tight squeeze indeed I think, or it would've been for me anyways. also watch radiator width, although you -can- force them down, some of them don't just slip along the bottom. my coolgates did, XSPC doesn't, you have to force it down, seems like case is just not quite wide enough down there.