Your best options would be to get a Swiftech H220/H220x/H320, or Cooler master Glacer 240L which is a swiftech H220 but has expandable capabilities to add more rads or water blocks, but this also gives the option to replace to stock tubing to something else. Of course while emptying the unit, then adding new tubes and then re filling. I got a H220X that i intend to change the tubes to white and eventually add another rad and gpu block.
I do not think that the major manufacturers of the closed loop coolers have the option of different tubing, other than the silverstone ones that use White instead of black. Mostly because all of these units are rebranded OEM parts made by one or two companies.