Robert-
I have the Green Monster and I'm very happy with it. I find it easy to set up and to use, and on my Berlebach 4032 it's as solid as a camera can be. I've never had a problem with the camera being steady, even in a decent breeze. I have not used a Deardorff, but I do have experience with other wooden 8x10 cameras and I find the Calumet to be worlds ahead in sturdiness. But you pay the price for that sturdiness in weight. The C-1 is heavier than any other 8x10 I've used, although only by a few pounds as it's the magnesium model.
The Deardorff does have some magic to it. By all accounts it's amazingly easy to use, and wooden cameras do look nicer than metal cameras. Plus the weight savings of a few pounds might make the difference for how far you're willing to walk with your camera. (Figure out the weight of your entire kit, though...you may find that the difference with a camera, a few lenses, film holders, and all of the other things you'll be carrying may make the few pounds difference fairly meaningless, or you may find it very important.)
I got the C-1 because it did everything I wanted a camera to do, the deal on it was unbeatable at the time, and I'm pretty much a monster physically so the extra pounds were not of concern to me. It's been a true workhorse, and I wouldn't trade it for anything (no, not even a Deardorff). But that's because the camera makes me happy...figure out what you really want and then get it. The surest way to end up spending more money is by buying stuff that you don't really want...in the long run you'll probably end up selling it, and buying what you wanted in the first place. Even if you sell a piece of equipment for what you paid for it, you'll end up paying shipping twice.
As to your original criteria, I can tell you that the Calumet (the magnesium model) is extremely sturdy, cheap, has plenty of extension (although I've not actually measured mine, but I use a Nikkor 480mm lens for close-up work), and has all of the movements I need (basically everything except rear rise/fall). It's my understanding that the Deardorff is lighter, has more movements (base and center tilt on the front versus center only), costs more and is not quite as sturdy. I personally find the C-1 very easy to use, but others have complained about the usability of the camera so perhaps I'm just lucky that the camera is right for me. The Deardorff may not be as sturdy as the C-1, but judging by the prints I've seen, people learn to work with the camera quite well.
Having had opportunities to "move up" to more expensive and more modern 8x10 cameras, I find that I passed because the C-1 is the right camera for me. I believe it'll be my 8x10 of choice until I can no longer carry it, at which point I'll be moving to MF anyway. For many others, the same is true of the Deardorff. I think they're both very capable cameras, and that the biggest tradeoff is weight versus sturdiness. If you can make a choice based on which of those is more important, then choosing between the cameras should be pretty easy. Personally, I think decisions like these are best made without thinking about cost, unless cost is a limiting factor for you.
Best of luck with your decision.
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