Overclocking is fun, we love it. However, not many people have had the chance to use a "Freon" cooled system. Anyway... in their 3 day sale Our friends over ExtremePrometeia.com are clearing their stock rooms and have the Mach II ST (no cpukit) going for £200!! including VAT. Speak to Phil - he will make sure that they don't cripple you on shipping either!
http://www.extremeprometeia.com/acat..._II_units.html
It is still on their site @ 364£ so, you will have to call them to get this, trust me it is a bargain.