Part 1 - Cooler Choices:
The solution is not to use CLCs for cooling... a) No CLC water cooler cools better than a comparably priced air cooler and makes and b) makes more noise not doing as well. CLCs also suffer from:
a) Mixing aluminum rads and copper water blocks leads to galvanic corrosion,
b) The additives that inhibit this, can no be replenished after their useful life expires.
c) Aluminum rads have poor heat transfer capability
d) To make up for this and get as close as they can to air coolers in thermal performance, they need to use extreme rpm fans which create a lot of noise.
e) As you have observed, the hoses a are set length and can cause installation difficulties being too long or too short
f) When used on GPUs, they don't do squat for VRM, memory cooling ... sometimes worse than the stock air coolers.
g) You can't add any more blocks or radiators.
All-in-Ome "OLCs" (Open Loop Coolers) ... like the Swiftech H series and EK predator line have none of these disadvantages.... you can simply pop the tube off, add a block, extra rad, whatever, add more coolant and you are good to go.
Part 2 - System Design:
When planning a build, you need to both select compatible products and try and make the system as balanced as possible.
a) Don't buy a CPU that is not compatible with MoBo ... of an overclockable CPU and put it in a MoBo that doesn't support OCing.
b) Don't buy RAM w/ tall toothy heat sinks which have no cooling potential and can interfere with cooler placement.
c) Don't buy a MoBo which doesn't have two x8 or better capable slots and an extra slot or 2 between PCIE slots
d) Don't spend a ton on one item and then go cheap on another as the latter may impact the performance of the 1st.
e) Select the umber of case fans or radiator capacity for your build
Here... if you need space for two 120mm fan mounts, you need to elect a case with at eats 2 of them ... and two of them that are not contiguous with one another.
For water cooling, here's a rule of thumb using the generally accepted target goal of Delta T = 10C. This is using a 45mm thick radiator 30mm will be somewhat less
For 120mm fans at 1250 rpm => 1 per each 85 watts of heat being generated
For 120mm fans at 1800 rpm => 1 per each 140 watts of heat being generated
For 120mm fans at 2200 rpm => 1 per each 170 watts of heat being generated
So for a combined system with 90 watt CPU and 200 watt GFX card, that CPU will be at 130 watts OC's and GFX card will be between 220 and 240 watts depending on how high end you went. Let's call it 350.
A well designed inaudible system (1250 rpm) would need 4 x 120mm of radiator
A well designed tolerable system (1800 rpm) would need 2 or 3 x 120mm of radiator
A well designed vacuum cleaner noise like system (2200 rpm) would need 2 x 120mm of radiator
So based upon your tolerance to fan noise, you'd need to buy a case that supported that for a Delta T= 10C system. Of course, you can let the coolant get hotter ... but that affects how much cooling you get.
CLCs are typically in the 1800 - 2700 rpm range ... but in any case ... (no pun intended), the case needs to be able to accommodate what you want to put in it. At 1800 rpm, delta T would be 12.5C ... which is still pretty darn good
If you were building new, I'd choose:
Swiftech H240 X2 Cooler ($150) - With 2 x 140mm (280mm) rads, it can handle 165 watts per 120mm at 1500 rpm. With 2 x 165 = 330 watts, delta T would be about 10.9
MSI Seahawk EK X GFX card - w/ built in EK full cover water block
Enthoo Pro case ($89) - fits 420mm rad
You will also need about 24" of tubing, some extra coolant and 2 fittings for the GFX card water block.
Your 120mm CLCs will also work in that with varying mount options ... 2 on top, 1 rear / one top or one front