If the sturdiest built mower for your money is what you are looking for, then I have to agree with ric. A ztr would probably be slightly faster, but not much considering the lawn tractor has a larger deck. A ztr mower is much more fun to operate, so if you want to enjoy your work more then ztr is the way to go. If you maintain your mower properly and don't abuse it any of the mowers you are looking at will last you better than 10 years. I ran a low end 42" scotts lawn tractor with. 17.5 hp kohler on my 1 acre lawn for 10 years and sold it to my neighbor 3 years ago. It's still running. Research the mowers you are interested in. Demo what you can and make your decision based on what you like best. Brand is less important than power train and deck options for your budget. Unless you are mechanically inclined, I would also suggest buying from a dealer rather than a box store.