Corsair Hydro Series H110 Liquid CPU Cooler

Yeah, cost is a big prohibiting factor with any custom loops. As far as leaks, I would actually trust a custom loop filled with pure distilled water or other non-conductive fluid due to a bad experience I had with an H100i that sprung a leak in one of its connections to the CPU block. For the most part I don't really hear too many horror stories about AIO units so I probably just had some bad luck with that one.

Yep, an open loop design is much superior. It's quieter, cools better, can be expanded to cover extra graphics cards and such, and can be customized to fit your style. However, even the most basic cost at least twice as much as a high end AIO design, they're harder to set up, and leaks are a very real threat. A lot of people, myself included, just don't have the budget for one, and even fewer have the time/inclination to do all the research that's required. AIO coolers are a good middle ground for these people.

corsair link sucks