The robot damashii GN Flag... don't want. But damn, the Sinanju looks sexy. And the Ahead design is pretty appealing, too.
Going back to the old models, I've just assembled this baby:
To me there was no RX-78. Everything started from Gundam Wing Zero and its Colony destruction.
Wing was the very first Gundam I watched and though it did not particularly impress me with its story, this is how I began my adventure with the whole franchise.