Watercooling an itx cube or micro tower

[stree]

I have an Evo Labs E-A2 and it can take a full size ATX PSU but like many I suspect if this class tha can take a full size PSU the remaining space for any CPU cooler is then very restricted.
I use a Silvtretta cooler with a G3258K and it is silent and cools very well, but I am running at stock speed and intend to overclock and I assume this will be more than the cooler can handle so am considering watercooling.
I have read reviews of H55-60 etc and Seidon and other common ones but the reports of noise and the bulky size of the rad and fan unit lead me to disregard these as a solution. I know there is the custom built option, but wonder if anyone has any thoughts or experience of this.
I am not interested in solutions for larger cases, the emphasis is truly small form factor, the smallest yet still capable and silent build

 

[LePhuronn]

Bulk of the rad? The Corsair H60 is a standard size 120mm radiator. In fact it's a bit smaller than other 120mm rads. And the pumps are only loud if you run them at full speed. I have a H60 in my Sugo SG05 and it's whisper quiet for both pump and fan.

So not quite sure what you've been reading or the conclusions you've drawn as a result.

And if you're worried a full ATX PSU will take up too much space, look at Silverstone's 450W and 600W Gold SFX PSUs - beastly units at 2/3 the size.