What components are you planning to water cooling? Cpu and N/B? Graphics card(s)? Rule of thumb if you want to overclock your cpu then you need to cool the CPU and the N/B (north bridge) for stability. There are many kits out there, and depending on how high are you planning on overclocking your system also depends on what kit to buy otherwise you'd be paying extra for nothing.
As for the kits. Well kits are sets of water cooling components that you can buy as one. Most kits usually involves a pump, reservior, tubes, radiator, cpu water block and gpu water block. While some less expensive kits would only have a cpu water block along with other components.
The Zalman Reserator 1 Plus is a good water cooling for it runs quite. It can do a great job cooling the cpu but overclocking wise I wouldn't recommend this to you for it is a passive water cooling. What I mean by passive is that, it only cools the water with it giant heatsink reservior. Overclocking involves lots of heat on the CPU and N/B so it needs to be cooled faster that it can produce those heat.
The KOOLANCE EXOS-2 EX2-750BK would be a good choice for overclocking however for the price it doesn't include a cpu and nb water block. Pretty much you will be paying for the fancy looks and LCD display which does not help cooling at all.
This is what I would recommend to you. A Swiftech H20-APEX "ULTRA" Series Liquid Cooling Kit would be a good choice. You can get this at FrozenCpu.com for $260 and then get a N/B water block for $30 and your pretty much set for $290 cooling kit.
This is one great water cooling kit. It has the best industrial grade water pump and runs quite as well. Large tubings for better water flow and 2 120mm radiators for better cooling. You can't go wrong with kit.
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