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The-John!!!
As far as a C-Band dish goes, first thing I would do is look around your neighborhood. There are still plenty of used dishes, out in the wild. Many that have not been used in years. You can often stop and knock on a few doors and get a used dish still in descent shape for free or almost free. Usually just to take it down and get it out of their way.
If that does not work, there is a company called TEK2000 out of Canada that has some reasonable prices on consumer C-Band dishes. Their dishes are pretty descent quality consumer dishes. I believe it is tek2000.com.
There are other places but they are sold for commercial use and get into the thousands of dollars.
As far as a good UHD receiver...since a lot of companies are still what it would appear as the experimental stages, there is not one that stands out as of right now.
I have an Amiko A4K and it works great on UHD and other stuff. It still though has some bugs on a couple of other transponders that I don't like. There are others out there, and perhaps someone will give other suggestions on that.
Also, is the setup of this equipment plug-n-play simple, or should I brace myself for a learning experience
Not plug in play, there is a bit of a learning curve like any hobby. However, the rewards are worth it, and it is not astronomically hard to do.
Just ask lots of questions here and you will get it. Also do some reading, and start getting familiar a bit with how this all works.