In somewhat of a dilemma. Need help in determining what type mower to purchase, i.e., Garden Tractor 20+ HP versus one of those zero turning type machines. Regardless of choice the machine will only be used for cutting grass (2.5 acres) on a fairly level lot with a few trees scattered about. Looking for a good quality machine that's easy to maintain. What are some things that are imperative the machine I purchase has? Thanks in advance for your input, appreciate it!