If you are interested in putting one together yourself you can get far better performance for the same price.
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D-Tek has their TC-4 on sale for $25.
-D-Tek has clearflex 60 1/2" tubing for a reasonable price (you'll need about 10'.) so that's about $15.
-And D-Tek has a "T" fitting for filling and bleeding. This is cheaper than a reservoir and just as good or better. $1.
-The CSP-750 from D-Tek is a great pump. $36.
-A chevette heatercore (radiator) costs about $20. at an autoparts store. 1/2" tubing will fit. You need to heat the tubing in hot water to help it stretch. Or you could get a "scratch and dent" pro core at D-Tek for a similar price. That way it has 1/2" barbs on it for the tubing.
That's $97. plus tax and shipping for an excellent watercooling system.
If you don't have a 120mm fan you'll need one.
A shroud for the heatercore helps quite a bit. You can make one from sheetmetal or tupperware. There's tupperware that fits the chevette heatercore perfectly. You just cut the hole for the fan.
You'll need a handful of screw-drive hose clamps which can be had from any hardware store. They're cheap.
This system would be very high quality and super reliable. Much safer than a cheap kit.