Oh, I see. I understand your amazement, because the article which I linked to recommends upgrading to Mint 17, not Mint 17.1.
Well, the article was written at a point in time when Mint 17 was the current LTS release. Mint 17.1 is merely an update to Mint 17. They are both LTS. Both based on Ubuntu 14.04. They will both be supported till April 2019.
Only currently Mint 17.1 will give you are a more recent MDM + a more recent Mate or a more recent MDM + a more recent Cinnamon.
In the near future Mint 17.1 KDE and Mint 17.1 xfce will be available, too.
I guess in order to avoid any such confusion we should add an amendment to xenopeek's article which will mention Mint 17.1, too. - Done.
Thanks to austin.texas for chiming in.