For your tasks, the KK should be good. There are a couple suggestions to make it last longer.
1) Have the dealer, show you how to remove and replace the blades. Actually, have them taken off. While off, put some neversieze on the bolts and moving parts. Bring your own to ensure it gets done.
2) After the first 3 mowings (10 hours of use), change the fluid in the gear box. You may have to flip it over, or use a suction device to get the oil out. Then change the fluid every fall before it gets put down for the winter.
3) Hit the grease fittings before every use. Every use, no matter how short the last use was.
Do that and it will last for a good long time.
jb