Well now that B.Renji has appeared in ubp you should be aiming to save vit for that now. Best possible f2p team now would be Shinso, retsu, B.renji and I guess H.Icigo or Stark depending on what kind of van you want.
my likley endgame team (f2p) is aizen, yama, main (ghostblade) c.orihime (or maybe shinso if i manage to get him from honor shop) and h.ichi
a relly stacked yama at that one who will kill enemy sup and mess with the enemy fury
but is seems like a potentilaay good tema
who will be your fastest partner?
id go for kisuke and make gin + yama t1 if you can