You first need to determine what your application/needs are. Do you want to knock down overgrowth, long neglected fields, or do you need to mow your 2 acre lawn? A rotary mower (Brush Hog)will do both but a hog won't be as good if you want a pristine golf-course like lawn, so not recommended. 5' is typical of Brush Hogs. Finish Mowers on N's work well with a 6'. With both, I highly advise to use an ORC and STABILIZER BARS. Know the correct method of installing bars. For an 8N, mow with POSITION CONTROL, in 2nd gear, 2/3 throttle. For a 9N/2N, use limiter chains or a Zane Thang Position Control device. STAB BARS prevent scalping when making turns and adds support as well. Some fellas use one bar and that will work okay. When brush hogging overgrowth, I highly advise you first take a stroll around the property to inspect for hidden objects that can damage your mower and/or tractor. Look for stumps, logs, large rocks/boulders, old discarded stoves and refrigerators, cars and car parts, dead deer, Jimmy Hoffa or other long lost bodies. Use caution, may have to go slow like in 1st gear at least on first pass, and make two or three passes. For brands, the popular ones offer parts & service. Be sure the brush hog has the stump jumper feature.
FORD 8N w/WOODS 660 FINISH MOWER & STABILIZER BARS: