Speaking of Wormadam, the trash coat one with buffer pieces and possibly Quagsire d can be pretty good. Not to mention the -10 from metal. I havent tested it yet, but it sounds good. =/
My favorite cards are Bannete and Absol. I havent really looked too far into the set yet, but Bannete is so much faster than Kricketune in the fact that it just sets itself up for a KO and takes advantage. Absol makes me want to punch the opponent, even when said opponent is myself. (I actually flipped a table once, but thats just me XD)
As for the great Bannete vs Gallade debate, I'd say its 50/50. It all depends on draw. Sure Bannete needs a stadium to one hit KO Gallade, but with ascension Shuppet Ralts might not get the chance.
I think that we all need to wait and see what cities has to offer before we make any assumptions on the "best card" though.
-Dustin