Worth buying a water cooling system?

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I would say more fans, h20 cooling is great if you are overclocking ect...

but if your not doing any of that and just want to keep the system cool go with a box with more fans.

Water has more advantages than just better overclocking.. you can set up an extremely efficient watercooling system that is dead silent, yet provides much better temperatures to your components. Checking for leaks is a good idea, but deionized water is $0.99/gallon at the grocery store and when mixed 50/50 with car coolant, is non-conductive, non-corrosive, and anti-algae. It's a little more maintenance than air cooling, but silence is golden.