"I'm looking for an economical way to mow with some sort of a cutting device set of to the side of the tractor."
Based on your initial statement and the size of your tractor, IMO you are pretty much limited to a sickle mower. I would not be so quick to discount the potential of one of these mowers. Sure there's a bit more maintenance, but they are pretty easy to maintain. I have a 7' on my 35HP AC D14 tractor and it works great for my 1/2 mile of road ditches and meadows. The only time I have problems is when I try to cut when its too wet. Easily cuts through elm saplings up to an inch.
I have a like new NH 451 that I paid $1200.
OrangeGuy