smallest usable model, October 2016
Mac Mini 2.6 GHz, 8 GB RAM, Intel Iris Graphics
iMac 2.8 GHz, Intel Iris Pro Graphics
MacBook Pro, all models
Mac Pro, all models
The cheapest option is the Mac Mini 2.6 GHz.
If you plan to work allot with videos, especially multiple videos in one template, a SSD drive is recommended.
For template editing we recommend Atom