Buying from a reputable dealer is the first part (you're right, there ARE alot of fakes out there). Knowing what you're buying is an important part of this...buying Cubans just cuz they're Cubans is stupid and a good way to lose money anyhow. If they get ganked at Customs, they just keep em, but I've never heard of them pressing chargers against the receiver. Some places also still guarantee delivery...if they don't arrive for any reason, they send another shipment.
All this being said, and while there are smokes from Cuba that I do enjoy, there are plenty of other smokes out there that IMO are just as good as Cubans, although different.
Smokin' & Jeepin' (Finally!!!)