Hello, I have about 2 acres with a slight slope and then one area that has about a 30 degree gradient. I am looking at either a Ferris IS500Z, Hustler Mini Z 48", or an Exmark Quest 48". I am not sure what to purchase. I will mow about once a week and would like to get something that has plenty of power and can do a very good job of mulching. I am located in MO so we get plenty of rain as well. Thank you for the help.