Heh.. WHy don't you get yourself a new PC first, and then decide if you really want water cooling?
It's a hobbiest/performance things.. I like water because above all it is near silent, and secondarily when paired with a good CPU, you can overclock the shit out of your machine..
It probably would go well with your new CPU because those in particular are supposed to be great OC'ers (I think someone took a 1.8ghz up to around 3.7ghz with water).
But honestly, enjoy your PC before you decide to wreck it with a leaky system or something ironic like that