..."since before I was driving..."
My goodness man, have some patience! I imagine I've got socks older than you are
If you want one, pay for it.....but do you really want one? What do you want it for?
Buy a cheap Disco, wheel with the 90's for a while and see just what it is that the extra seven inches of Disco wheelbase can do for you.
Ours sits in the garage and the Disco gets used up. I don't mind beating on the Disco at all, but I'd feel badly for using up a resource as scarce as the D90.