Welcome to the forum, Championjeremy.
I'm reading two questions here: are the prices mentioned good value for the piano and which piano will serve best in a church setting. Am I right?
Here's my opinion, for the little bit it's worth.
The Wm. Knabe is the best buy, in terms of discount. It's discounted over 20% from Pianobuyer's SMP (suggested maximum price). The Kohler & Campbell is discounted less than 10% and the Pramberger is a tick over SMP. If you haven't read Pianobuyer's pricing guide, you need to. Here's a link:http://www.pianobuyer.com/fall11/brand-index.html
PLEASE read the introduction. The link is at the top of the page. You won't get the complete picture without the introduction.
Of the three pianos mentioned, I would lean toward the Knabe or the K&C. The Pramberger signature line is a cut below. You would need to move up to the Pramberger platinum series, but it'll cost as much as the Knabe. I guess I'm saying that the K&C at the right price would be your best bang for your buck, but the quoted price is too high.
Now to the second question: What'll work best in a church setting. I'm not the one to answer. You need the advice of a tech who services these pianos. I'm sure one will speak up soon.
Other suggestions: Have you considered Hailun 178, Brodmann PE-187, Ritmuller GH188 or Weber AW60? These appear to be among the best of the Chinese pianos. They're well spoken of here. You'll get pretty good value with these pianos. The Brodmann and the Ritmuller are both 6'2", so they might be be a tad large. The Hailun is 5'10 and the Weber is 6'1". Weber's AW57 is 5'9", if you think 6'1" is too much. The question is how will they serve in a church?
Anyway, I'll back out here and let others tell you why I'm completely out to lunch.
Best of luck.