Strictly speaking you don't really need any moves at all. I personally do all the following, none of which require any sleights and all of which are extremely powerful:
Maurice Fogel 3-card prediction
The Oldest Trick in the Book (David Regal)
Out of this World
The Moving Pencil (Lorayne)
The Big Easy Force (Racherbaumer)
If I had only three moves, they would be:
The spread cull also gives you the MC Spread Force (Mike Close) which is both a force and a switch.
That should cover you for quite a while. If you have two more, I'd probably choose
I thoroughly agree with Horace about the value in working on being a better performer vs. learning another move.
I've seen many, many magicians who are very skilled at sleight of hand but are extremely deficient in basic performing skills. I can't recall if I've ever seen a magician who had great performing skills but was deficient at sleight of hand.