Nicolas, I'll try to give you a little info and will no doubt be joined by others with even more to say!
1. Yes, with a Speed Graphic having a built-in focal-plane shutter, you can use pretty much any lens you can mount on its board. Remember that many lenses out there were not designed for large format so you must check out their coverage if you want full 4x5 negatives/slides. LF barrel lenses are much cheaper than lenses mounted in shutters as a general rule.
2. I don't find the rangefinder very important on my Super Graphic since I don't use it...I focus with the ground glass and use the Graphic like a field camera. By the way, the Super and Super Speed Graphics were made late in the Graphic history and are usually found in pretty good condition; they are smaller than the Crowns and Speeds and have a revolving Graflock back which is handy, but they do NOT have a focal plane shutter. My camera does have a working rangefinder set for the 135mm lens in case I want to use it hand-held.
3. I've use 90mm lenses on pretty much all of the 4x5 Graphic models and I don't remember it being a problem on any of them...they work fine on the Super series. Shorter than 90mm can be problematic.
4. You can get a 6x120 back for any of them...Calumet slide-in back for those with spring backs, many other brands for those with Graflock backs.
5. 90mm's and 210mm's are nice and I use them alot, but your new camera will probably come with a 135mm or a 127mm already on it and is perfectly useable as a starter lens. Most press cameras seem to be sold with a lens mounted. As you have already gathered, I'm partial to the Super Speed and the Super, but Crowns and Speeds in good shape are still good workable cameras. While I don't use it much, I do also own an older Speed Graphic with a spring back.
The important thing is to get a good conditioned camera and learn how to use it! Have fun!

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