The 22198's that we have sold are solid (and heavy!) performers. You can run the machine pretty much all day on one fill up and the larger oil capacity should make the engine last a long time between oil changes.
We've found that getting parts for a Kawasaki engine can be slow and generally the parts are more expensive (than comparable parts from Briggs or Kohler).
Having said all that, Toro has an excellent supply of parts for the deck and tranmission and blade drive mechanisms. These areas are going to be where you will need major repairs.
As far as the 22043, getting Suzuki parts is even more difficult than Kawi and if you can't second source, expensive. We attempted to source a Mikuni carb for a Suzi and it was outrageously expensive.
If I was going to suggest something else, I would say a 22196 which is a 21" BBC with a Honda motor.