Water cooling has never really interested me....
i can pull the same performance as any water cooled rig (with matching specs), mine just runs hotter.
you may be able to pull an extra 400-500mhz OC if your lucky
so the benefit is not high enough for me ..(performance wise)
the extra cost & risk would really only buy me ..extended component life, & in this day & age its hardly a worry.
the noise factor really don't bother me ....i only have 1x 80mm intake in the side & the HSF...but yours might be a lot louder.
if you heavily OC then it may be a useful addition.