I wish I could find the article that mentioned abadoning MATE, I looked without success. This is good news for anyone that has an older machine. It looks like I need to do some more research into the next edition, and I hope that the MATE version will install using the MATE desktop. Incidentally, after the installation, Gnome 3 does start up, with the panels loaded, however the text in the panel and menus is partially missing - Cinnamon gives the same performance, so MATE is the only thing that I think will run well on this machine.
Dell Dimension 4600i, nVidia GeForce 6300, 4 GB RAM, Linux Mint 13 32-bit, MATE edition
Dell Latitude D400, Intel Graphics, 1 GB RAM, Linux Mint 13 32-bit, MATE edition
Gateway DX4860, Sapphire Radeon HD 5450, 8 GB RAM, Linux Mint 13 64-bit, MATE edition