The H100i isn't worth selling(to anyone), after you've owned one you'd want to throw it in the bin as I am contemplating.
If its the need to recuperate your funds, getting the Hyper would be better, keep yourself on a mild OC and when the time comes you can sell the Hyper however, with blokes like us, we actually have a spare cooler at hand...so the Hyper fits the bill on both fronts of the fence.
But yeah until the time comes to shell that hard earned money(assuming
) might want to read the watercooling sticky, and then some more and
then some more - it'll make sense
but like me, when you've organized a list of parts, you've already figured out how the thing looks and the sort of layout you'll have without falling into any snags along the road since you've done your research thoroughly.