You will never regret buying the Kubota. They are really well designed and manufactured tractors.
The difference between 27 and 29 hp is probably not noticable, but some of the other features are worth the money. By the time you hook up the tiller a 1/2 a dozen times you would gladly pay for the adjustable links.
More HP and size simply allow you to do more work in less time. The same thing that a 6 ft mower does vs a 4 ft mower.
I use a 6 ft brush hog and would have a nearly impossible time with an undercarriage mower as the grass grows too fast and the finish mowers do not do well on tall grass.
You will appreciate all the HP you have when using the loader with front wheel drive. The loader also allows you to lift things that you could not handle without the tractor.
A tiller is a pretty good load on a tractor depending on the soil condition. Tillers are also pretty heavy and bounce around a lot when you hit hard soil or rocky soil. Bigger tractors hold them in place better than small tractors.
Kubotas rule the compact tractor market and have made big inroads into the utility tractor market because they are so reliable and work so well. /w3tcompact/icons/smile.gif