Me and a friend are doing a schoolproject about watercooling. We are comparing watercooling to aircooling. I may not cost to much, so we went on the internet and found this. A XSPC X2O v4, and a Thermaltake Pro-water 850l. They cost about the same, so that's no problem.
while most "kit" watercooling systems will work, they are generally far from ideal. if you look at at them from a pure cooling standpoint, they are about the same efficency, or slightly less than a good fan setup.
to see a good difference in temperature, you would really need a larger system. one of the limiting factors in the kit setups is the small volume of coolant. water generally is not as efficent at disipateing heat as air is, hence a larger volume/surface area of the radiator is needed to see significant temp improvements.
the kits you listed will probably work fine for a standard/non overclock setup, but if you really want to show the benifits of watercooling, you would definately want to build one from the ground up.
if your really set on useing a "kit" style setup i would recommend going with a resorvator v2 system. remove the stock pump from inside the coolant tower, and add an external pump and a good 2pass external radiator.
since as you stated you are new to watecooling, id recommend looking around online and doing alot of reasearch before you make your decision. learn what problems are associated with it, as well as how to set up a system to be as efficent as possible. expect to pay anywhere from $350~$500 for a good cooling setup
RJR has pointed you in the direction of what you should be looking for as a beginner if you are looking for something that is a 'kit' or some matter of one. Those components are much better and in-line for what you are wanting to look for in a real watercooling installation.