OK, I'm seriously thinking to try a 9x12cm folding plate camera but it looks like there are a zillion different types out there. I narrowed it down to a Zeiss Ikon or equivalent because people say it's more easy to get the holders. Now what about the different lenses? Which one is the best or which one is best avoided? I would like to get some info on how the holders work too, I suspect the procedure of using one is very much like a viewcamera (I've already used a Cambo 4x5inch)? or am I mistaken?

Since I'm not very familiar with this kind of camera I rather planning to buy one on a camera fair because there I have the opportunity to test it and see if it's in OK shape (unless somebody here has one in OK condition to sell ). Anything to look out in particular?