A couple of questions. 1) Difference between a z4 and z7. 2) Is the suspension seat worthwhile? 3) Are the flex forks worth it? I am looking at a z4/25Hp/54" deck. Is that enough HP? I see a lot of other dealers selling large decks and small engines. Why? I am a homeowner who will be cutting 1/2 acre manicured lawn and 1/5 acres of not so manicured backyard. My trusted Husky, 18/48 riding tractor just died and I am in need of a replacement ASAP. Tell me about Gator blades. Thanks!!!