The choices are:
Sailor Moon Future #6 (and 7, etc.  I plan about 13 of them.)
Rendezvous with Ranma (the Childhood's End sequel, and this is a comedy)
Futaba-kun Change/Ranma crossover (no title yet, more or less comedy)
Sailor Moon/BGC crossover (serious, and _no_ time or dimension travel)
Tenchi/Wind named Amnesia crossover (serious)

I put my vote for Futaba-kun Change/Ranma crossover.  The possabilites are
endless.

Phoenix Ikki