Scifibigbang 2014

scifibigbang opens tomorrow, and while I know I'm going to participate (or at least give a good shot at doing so), I have no idea what I'm going to write. So I'm hoping for a little feedback from all of you! My choices are:

A) Doctor Who/Being Erica crossover fic (probably featuring Eight, but I'm not sure yet)
B) Doctor Who fic with Eight, Chang Lee and/or Grace
C) Tanken Driland fic (a.k.a. the obscure anime series that isn't even fully subbed yet)
D) Danball Senki fic

There's always the possibility another idea will hit me before the end of February, but those are the ideas I'm considering right now. Thoughts? Have a suggestion of your own?