A romantic pairing I always wanted to see happen is a stable Jean Grey aka Phoenix with Danny Rand aka Iron Fist.
In Chinese mythology the Phoenix and the Dragon are a representation of two halves of the same coin. A yin and yang type deal. In the mythology their love is everlasting, which is interesting for the comic versions since they two are potentially and essentially everlasting. With the Phoenix continually coming back to the life and under the right circumstances(as in not being killed) Iron Fist being Immortal the two could follow the same tradition as their chinese counter parts.
Then their is the elements of their costumes. When Claremont progressed Jean into the Phoenix role he gave her a strikingly similar costume to his other creation Iron Fist.
Probably mere chance on the aritst part but how epic could it be that they where born of the same fire. Their histories are already alined due to AvX, why not have these two join forces to become Marvel's Ultimate Power Couple?
I feel that their is so much to mine from a story where two forces in the MU are bound by love to over and over again find each other. It could explain the Phoeinx Force perpetual rage and self destruction. Maybe it became to unbound and is seeking it's other half? Or maybe Shao Lou lost some of his might and feels no longer worthy of its mate.
Whatever the case maybe I think it make for incredible stories of symbolism and power down the road. Not only that it would get adult Jean Grey a chance to grow as a character in the greater Marvel Universe. While also distancing her from Wolverine and Cyclops. To add Jean and Danny do have a brief history with one another so it wouldn't be completly out of left field on that stand point.