What should my next pet be?

The Extra Pet Giftbox is sitting in my Attic, waiting for my next choice. Now that KaiserSeahorse is a Zoosh (we'll work on cossie later), I'm wondering what should I choose for Pet #13.

So far, I've narrowed it down to either a Sybri or a Yuni. I think Underwater Sybri are adorable. Yunis I'm not sure on cossie, maybe Tiger or Splatter. I'm wondering would it be cheaper to buy a Yuni maker or attempt The Fates mission. I hear it's tough, up there with Blitzen and Greedy Gertrude.

*sigh* Either way, this is going to cost me. Time to raid my Attic for things to sell.