For a golem powered farm, if you want to go that route, you'll need a pair of golems.
Simply set up your farm as normal (about 9x9 is about perfectly sized for a golem farm imo, but you can get away with a little bigger)
Then get yourself a straw golem and any kind of golem, along with an order upgrade, a harvest core and a gather core.
The second kind of golem is up to you, but i'd suggest a wood or flesh one. You could optionally give this golem earth or air upgrades to increase how many items it can carry or how fast it is respectively.
Place the straw golem around the center of the farm, give it the order upgrade (do this first or it'll run around uprooting everything) then give it the harvest core. Place your other golem on the side of the chest, and give it the gather core. (You can also use other item retrieval methods such as item vacuums or vacuum hoppers, but the latter has a fairly short range and probibly won't cover the entirety of the farm by itself.)
The main caveat to the golem farm is that the golems don't partically like water too much. (EDIT: The only flux you could get from golems is any made in the production of them, and that's probibly not going to cause you any issues. Once set up they have no running costs at all.)
There is another option, which is fairly cheap, but could be a little cpu intensive is the rotarycraft fans. Powering them for crop harvesting is simple, give it power from a steam engine (rotarycraft one). To get the steam engine to work you just give it water from the back, and put lit netherrack underneath it. That'll power the fan forever once it heats up. They have a range of about 10 blocks iirc, and you'll want one fan per row of crops. The fans will harvest any grown crops, replant them and blow the produce along. Put a wall at the end, along with some item collection method (and you have alot to choose from in monster) and there's your farm. While on the subject of Rotarycraft, I'm not sure if this is in the version of Rotarycraft you have on monster, but I think you can grind the wheat in the rotarycraft grinder into 4 flour, which you can then smelt for 1 bread each.