I'm in the market for a new mower. I currently have a Lazer Z 52" w/ Kohler 25 HP. I'm leaning toward the Lazer Z 52" w/ 27 HP Kohler a/c carbuerated engine. Most of my properties are residential 1/4 to 1/3 acre. I'm picking up a lot of properties with concrete curbing around the planter beds. I have some difficulty keeping the tires off the curbing during the growing season when the grass is high as I want to get the deck over it to cut down on extra time spent trimming. Are the drive wheels on the 52" HP version inset more than the Z that would help with this? I'm tall and feel a little scrunched sitting in the HP and I like the as much horse power as I can get and I think 23 is tops for the HP version. Any comments appreciated. P.S. What is the cost of the full suspension seat and for anyone that has them, is it worth the extra $$ for the differance in comfort?