So far, the enchi have been in more combos than the others.

The enchi lesser, the Mochi (enchi mojave) and the Tiger (Enchi Desert) are some of the best.
The super form is good looking too.

The spot nose is another morph that you don't see around enough. Some of them are really nice. Some people say it's not really a morph, but when you see one, you will be able to tell them apart from the normals. I must say that the name doesn't really help. The only combo I can think of so far is the Twighlight ! Quite nice. The super form, the powerball is quite nice to work towards too.

I don't know much about the vanilla so I will skip.

You should also consider the Fire if you don't have it. A nice morph, that makes combos go CRAZY. The Firefly is just insane.

I went with an enchi and a fire, who are both the ones I liked. I nearly got a spotnose, but decided to wait a little more, since finding a female was harder and I had enough male at that moment.