Travis-
I'm sure something in your research has lead you to the Graphics as the cameras you're interested in getting to start. I can't question that decision without knowing what kind of photography you want to do . I will, however, note here that you can generally find an old Cambo or Calumet monorail in the same price range as a Super or Super Speed graphic in reasonable condition. (Figure around US$200 or thereabouts on eBay.) The monorails aren't as convenient to carry into the field, but the old Cambo and Calumet models aren't all that difficult to carry either. There is, however, absolutely no chance you'll use such a camera hand-held.
You mention in your post that the Graflok back can be rotated, and others have noted that you can just rotate the whole camera for the Graphics that have a spring back. The other thing that a Graflok back will give you is a much easier adaptation to a roll film adapter. Roll film adapters that fit under a spring back are available, but not as cheaply or as easily as such an adapter for a Graflok back.
If your plans include roll film, keep this in mind (although I personally think you'd be better served by ignoring roll film for now and learning to use a 4x5 camera to get those great, _large_ negatives or transaparencies for a while). Roll film is cheaper to shoot, but the impact of your first 4x5 negative or slide is much greater than a roll of 6cm film, It's easier to speed things up and blow through film with a roll film back, but my personal experience is that shooting single sheets is much more contemplative and a better learning experience.
Whatever camera you end up with (and I think any of the 4x5 Graphics newer than the pre-Anniversary model are fine choices), spend some time learning to use all of its features before you start to look for something with more capabilities. I personally find myself using back movements more now, but when I started out doing landscape and architectural work in LF, all that I normally used were front tilt and front rise.
Be well.
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