I been using a 72" Bushhog brand finish mower for 15 seasons now. I cut between 10 - 14 acres depending on how much time I have. The only problem I ever had was the wheels had bushings instead of bearings. Bushhog offered a bearing kit upgrade which I installed and have had no problem since. I think I'm using the 3rd and 4th set of blades now. I try to keep one set sharp and ready to go on the mower when I need them.
I would not hesitate to buy another Bushhog brand mower.
One key feature to look for no matter what the brand is the blade tip speed. Mine for example is about 15,000 FPM. The faster the tip speed the higher the cut quality will be. Not all but most of the off brand mower have a very slow tip speed and their cut quality suffers because of it. Been there and done that myself. Not only that, generally the entire mower is just not built as well. Another thing to keep in mind is parts. If something breaks you don't want to have to wait for them to be shipped from across the pond somewhere. This is one example where you really do get what you pay for, in my opinion of course.
Unless it's going to break the bank my advise would be to go ahead and get a name brand high quality mower. You'll only need to buy one because with propper maintenance it will last you the rest of your life.