A) kits suck
B) kits suck
C) kits suck
D) kits are expencive
E) kits suck
so the point is. do it the cheaper. more entertaining and more efficent way.
its prettty simple.
choose your layout.. just cooling the cpu? etc...
then buy your water blocks (or make them if you havea cnc mill!)
custom blocks tend to be better made and have much higher performance,
then buy your pump. now a smart man would look for a pump in common use thats easly avalable second hand. in the uk a central heating pump is a hands down winner. capable of pumping out GIGANTIC amounts of water as its deisigned for basicly watercooling a house.
then you need your tubing .. 1/4 or 1/2 and some hose clips
and last the most important bit, your heatercore. differnt to a computer rad beacuse its used in Cars, these tend to be better suited to water cooling. and can also be salavaged out of old cars for free!
ive got a nice simple loop that cost just under 100£ and performs so well it runs passivly. with an external rad.
40c passive over 26c ambient with not even pump noise is nice. with the pumps and fans on temps are pushed down to nearly 8c over ambient (34c)
anyway stop arguing over silly kits.
only one thing to be aware of is metals! like sentinal said .. some metals don't play nicely with each other. but tbh .. my rad is aluminum. its just has extremly dencly packed fins and is rather large (2x 120mm and thick)
though if you use a mostly ALU system or mostly copper system you won't see much corosion aslong as you use proper ethelyne glycol (blue toxic stuff that garages will sell if you bring your own container) used as a antifreeze and corosion inhibter.
you will never stop your alu or copper from rusting though!. it will only slow down the effect. but the rust forms its own protective layer against further rust so its not so bad.