I also have 5 acres. 2 in yard around the house and shed, and 3 of it pasture with a small 2 stall barn. I opted for the CK20 and it has done everything I asked, although if physical size wouldn't have been a limiting factor, I probably would have bought larger just to get more HP or definitely would have bought more HP in the same footprint if they had that model. I sold my riding mower that I used at my old place and use the CK20 for everything. Brush hogging and finish mowing, loader work, and most recently tilling.