I don't know if I will get it, I have already played Pearl, but I actualy got a bit bored of spending so long with training a good team, I probably would only get it if it truly had somthing different to offer, as in it is not almost a complete copy of D/P.
Actualy I quite enjoyed Mystery dungeon, I havent completed it yet, but I kind of like some of the changes, I was a Charmender, could attack up close and have smokescreen, so enemy couldn't attack, and had a partner Chikorita who was mostly long range. I dont think it was a bad spin off, but was interesting for some actual dialogue/personality to the normaly standard ones. I don't know much about Ranger, but I think one of the times I saw the anime with a ranger on it. Pokemon has expanded quite a lot over the years, I have actualy found it realy frustrating to go back to the old games and things not being the same such as smaller character and rules that had not been added yet.
_________________
Through dream I travel, at lantern's call
To consume the flames of a kingdom's fall