@Potions -
Vineyards can be extremely powerful, Scrying pool is just pure awesome, Familiar is often unskipable, Alchemist is nice but extremely boring and slow. Possession-shmoseshion, OP with KC, otherwise I don't care too much. University is great on some boards, sometimes is just.. mleh. I usually skip Apothecary as it never seemed interesting to me, Golem on the other hand I love so much, my fav is Big Money + 2 terminals + Golems whenever I have potion and less than 6$. Esp if 2 terminals are things like 2Monument or Cutpurse + Militia or Vault + anything, even Woodcutters work. Feels almost like Hunting Parties sometimes.
Single Transmute for Estate -> Gold is ok-ish, though its crap later. You'd really have to be desperate to turn actions -> duchies (Duke and few other cases aside).
@List - 2n-1? I don't really get this. This is a formula for what? If n is number of KCs, you can play 2(n-1) + 3 additional actions.