I recently bought a Ford 515 sickle mower with a 7' cutter bar for $325. I use it for the same type of stuff you want one for. According to the manual (which I got from the New Holland dealer for about $10) it weighs 506lbs. My New Holland TC29D weights around 2600lbs and handles it easily. It works good for what I bought it for, but it took some work to get it to work on my tractor. It has an "break back" arm that needs to be attached to the tractor and the bracket was missing, so I had to make a bracket and bolt it to the tractor. Also, since it's over 25 years old, it needed some maintenance, minor repairs, and a complete lube job. I still need to adjust the guards to get it to cut right, so I have about and hour of work left on it, but once that’s done I should be all set. It sure beats using a weed wacker! I can mow over ditches, under trees with low branches, etc.