Full size fridge vs mini fridge is a space concern. Get bigger if you have room. YOu can store bottles/yeast/ hops in the extra room of a full size. If you go mini, mkae sure it doesn't have a freezer compartment.
For tempo controllers you can use Ranco, LOVE, Johnson Controls A419. All popular options here. You can buy the Ranco and Johnson models prewired. THe Love will give you a more professional,cleaner looking install. These can be used just as well with fridges and freezers a like. The option you choose between fridge, minifridge or freezer, just depends on what final style you want.