I have bought a few ships simply because of the upgrade cards such as the K-wing. But with how fast FFG creates new waves plus all of my other hobbies, I have to be selective on when and how many ships I buy. The TIE Punisher for example I can do with out (for awhile). There is nothing in there that I think is a must have. Some fun pilots such as Redline though. I probably wont buy the ghost ship either or punishing one unless they have some neat crew or upgrades.
What ships are you ok with not having?