I have both! My C-16 was an eBay purchase over 12 years ago. Paid over $300 for it (with shipping), so, Will Meyer. I don't think your prices aren't off base.
Now I've been working on a C-19 that I acquired from someone I know at a reasonable price, but have had to do a bit of work to get it where it is at. So it depends on what you are looking for as to how much you will have to pay! A unit that is in great shape and can sing right out of the gate, C-16 around $450 to $550; C-19 around $1,100 to $1,500. If you are willing to settle for one that is not museum quality or might need some TLC, take a few hundred off the price for the C-19. A hundred or so less for the C-16.
Having both units, I have to say it is a toss up for the most part. Both are incredible units, but I have to admit, I've been wanting the -C19 ever since I heard one 15 years ago, but could never afford one. Now that I have been able to learn enough (to be dangerous), my skills are such that I felt like I could take on a unit that needed some TLC. And now that I've been working on it (almost ready to go) I have to admit, the C-19 wins out in my mind. Others feel differently! The C1-9 is going to take the place of my trusty C-16 in the main setup and the C-16 will move to my bedroom setup!
Sorry for the ramble.
Welcome aboard. There is no turning back now!
Neil