I'd say adjustable is not really worth it unless you intend to do lots of fitting and even then, I found mine rather pointless as I can adjust the waist, hip, and bust but not the bust shape or shoulder slope or bum shape and so it was never close to my shape anyway.
However I can see the value of having something to stand the garment on so you can get a better view of it, or as you say add embellishments.
In your case you can probably save a bit of money too by going for something older and more solid.