While extra storage is always good, I dont see the point of going overboard with 128 MB of RAM.
Do you even erealise that the more RAM the more batter consumptions also ?

Better is the freedom of having a decent amount of inbuilt memory and then some extendable memory.

And also with a huge ram space and 1000's of pics and videos on it, comes the extra overhead of indexing all that on the fly - thus getting speed bumps in performance and complains of "Oh why is the N9 so sputtering when I do things while music is playing or whatever ?".