If you can pick any A lens to go with EA2 what would you get?

If you have unlimited budget to get just one A lens (SAL, or another brand) to go with a EA2 to compliment your existing E lineup, what would it be?

(My EA2 is arriving in two weeks and I've gotten approval to buy whichever lens I wish to go with it I currently have E50, E30M, Z24, E55210).