If you're looking for a 3pt rotary tiller now seems to be a good time to buy. I've been researching them for the past few weeks and right now they are on sale at various places. King Kutter, both the Professional and 'II' models, as well as Tractor Supply's CountyLine brand. I managed to snag a KK Pro 60" in JD green for $1499 with only $125 shipping and no tax from a fleet store that also sells online. But various tractor/farm/fleet places have them in this ballpark.
As for tiller models themselves, what I've been able to learn is that the KK Pro and II are basically the same tiller in terms of gearbox, driveline, and tines. The Pro has a different shape on the top that helps keep grass/dirt/water from building up. It also apparently has 3pt hitch specs that are quick hitch compatible, even though people say the II model also works with quick hitches. KK themselves say the II model is NOT quick hitch compatible.
Anyway, hopefully this may help someone else get a good deal if you've been looking for one. PM me if you want to know the specific places I've been seeing them. I'm not here to advertise for anyone so I'm not spelling it out in the post.