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Noctua NH-U12P is pretty much the easiest thing I've ever had to deal with. The NH-D14 is easy to install, but the rubber bumpers and fans aren't as easy as on the NH-U12P. I guess the stock Intel HSF is pretty much the most simple, easiest to install kit.
Thermalright's Archon, HR-02 and Silver Arrow aren't too bad, but not as easy as Noctua. Couldn't tell you about any others as I've only ever bought from those two brands, used the stock Intel HSF and tried out a couple others that were terribly difficult like the old Thermalright True Black Ultra.
I have a hyper 212+ and I found it decently easy to install(privded you put the fans on after you have it mounted properly), there is also a newer coolermaster unit the X6 ELITE that is apprently one of the easiest to install and wickledly good coolers at a fair price(its size is also not quite as large as most tower coolers and still has great performance and very good compatibility)