This is a very interesting pick, and I could make a case for Nisei, Power Shutdown, Subliminal, Bastion, Enigma, or even Tsurugi. Nothing clearly amazing, but lots of solid cards.
Some things to keep in mind:
Given that we are playing to 6, not 7, Nisei falls a little in my mind. When you are trying to score 2+2+3, scoring a 4/2 is quite useful. When you are trying to sum to 6, it feels a bit worse.
With a 30 card deck size minimum, youre probably looking at a 34 card corp deck. You'll probably want about 13 ice. That means that youre looking to take about 3 ice from each set of 10 cards (four sets total). Each pack probably has 2-3 solid ice, and then the quality declines from there!
Tsurugi is pretty good in a format without many parasites! There are only 2 parasites in the whole cube, for 6 people. Still, I think I'd take Bastion or Enigma over it here.