If your case has the room for it the Noctua NH-D14 and NH-D15 are amazing air coolers. Ugly though. Slightly below or even on par with the H100i while being $30-50 cheaper.
The H100i is still great though, if you don't want or can't fit air cooling it's a fine choice.
For $50 more you can also get a Swiftech H220X or H240X. Now those are truly great All In One liquid coolers. No maintenance needed (aside from the usual dust cleaning), expandable into a custom loop, fantastic performance, surprisingly quiet. I'm still waiting for mine.