They have changed the packages since I bought mine. I have the anniversary Aurora LX package with Star Citizen and Squadron 42. I think the best option is to get the cheapest package that either includes the standalone campaign, or get that as an add-on.
The Mustang Alpha Star Citizen + Squadron 42 or the Aurora MR packages for $65 gives you everything you need to get into the game. (I would recommend the Mustang over the Aurora, but it really doesn't matter at this point. Either one is a starter ship and you will want to upgrade as soon as you can using in game money)
They also have "free flight" times where you can try out other flyable ships without buying them.