"with an emphasis on Ginny" forget that idea. With all the bad H/Hr and H/G stories out there i suggest you pick anyone but them. It would just carry over alot of bad mood onto your story.
Use your imagination! Don't redo the same worn (and very bad) track.
Heck i actualy prefere to marry harry off instead, aslong as it didnt involve Hermy or Ginny it could be quite intressting.
I really like Ginny as a character, and dislike her with other pairings, that's why I love the internet and the idea of multiple pairings.. It makes the impossible, possible! =P