First off, welcome to the forums!
The performance Koolance Case looks pretty good, but you'll probably get much better results with a kit that you install into your system. A good example of this is a DangerDen kit. Very good. Find them at
www.dangerden.com.
You use mainly water, with Watter Wetter for a bit better cooling, and some anitfreeze if you plan on getting your water really cold or really hot. Generally if you have your hoses clamped well leaks aren't a problem, but running the system for a day or so out of the system is a good idea to make sure you're not leaking anything.