What kind of cigars to get is up to you, as everyone's tastes are different. If you are looking to sell them for a profit, I would suggest Cohiba or Montecristo, as those are the two names that most people know, (though here are tons of other good brands available).
When you buy the cigars in Cuba, make sure you buy them from either the factory, or a licensed outlet. They will be more expensive, but they will be REAL. For example, I had a friend pick me up two boxes of Cohiba Piramides, I paid $230 for each box of 25, or $460. That sounds like a lot of money. But when one thinks that Thomas Hinds tobacconist is selling them for the moment @ $59.30 each, or $2965 for the two boxes... You get the idea.
Personally, I never buy cigars from people who have been on vacation from Cuba (unless they can produce a receipt), most people buy the cigars on the street and end up trying to pass off shit.
Oh, and for the love of god, store them properly once you get home... in a seasoned humidor. They can go stale in as little as three days if not stored properly. In as little as 6 hours if put in a fridge.