I am considering purchasing an iMac 27-inch for my web development business; of course, linux-compatibility is a major issue for me. I know that Linux has been run successfully on various models of the iMac, including the 27 inch version, but of late it seems that the Linux graphic driver universe is going through a tough time.
Super nice Apple iMac 27" Late 2013, which is the latest model. This is the 3.2 Ghz Haswell i5 Quad Core. I'm the original owner purchased just a couple months ago so you can still get Apple Care if desired. In literally new condition and performing perfectly. The screen and glass are perfect with no dead or stuck pixels.
Apple’s new redesigned iMac marks a significant departure from a physical design that the company has basically used for its all-in-one desktop since 2007. The 21.5-inch iMac represents a significant visual change and packs a lot of new stuff inside the entry-level $1,299 version as well, which is the one I received for testing.