If you could choose a set to finish?

[TickledPink]

Someday I'd like to complete the g1 princess ponies set.  I only have a couple of those girls.

[prancingstag]

Aww, you need to already have one from the set... I'd be all up for both starting and completing the second set of Pony Friends.

If it can be considered a 'set' I'd love to complete the G4 Crystal Empire collection. The only packs that didn't come to Australia were my favourites out of the whole line. Glimmer Wings Diamond Rose & Pinkie Pie and Sweetsong & Fluttershy, and the Princess Ponies collection with Celestia, Luna and Cadence.