Some will tell you that SPA's in the beginning are amazing. Others will say they are rubbish in the beginning and your better off creating them. What is comes down to is that it's a good idea to play a few games with and without them to see if you like either.
Now considering you told us your going to be playing these games tomorrow, there's only so much advice we might be able to give. I, for one, am not a seasoned Levi player. Though, he is my main Master. I can't really speak for your list as I am not one who uses SPA's in the beginning, nor have I played with Bete because there's a few other models I like to use out of the ba-jillion you can choose from with Leveticus.
Jack Daw, Killjoy, The Hanged, Teddy, Necropunks, and Punk Zombies.
Jack - because he really has quite a bit of synergy with Levi and Alyce and his drawbacks really aren't that bad when you think about them. Killjoy - is just a tank used to force your opponent to concentrate on the big scary model, while Levi works his magic. The Hanged - work well but for the most part I just like them so I use them whenever I can. Teddy - .. well he's just fun to play and he's so fluffy (obviously Jack or Bete are a better choice for 9ss ) Necro's - for objectives and Punk Zombies - for nice well rounded 5ss models.
Phew, sorry that's so long. Haven't posted in awhile. But that's just my two cents.