I love this question!
"Top-rated" can be kind of a big statement, because a lot of coffees can be top-rated for different reasons, whether it is for the fact that they can be prized varietals, high-scoring coffees, or exclusive. I will touch on some varieties, since these are so discussed right now in the specialty coffee world.
Eugenioides - This is a coffee species that has been very popular for competition in the World Barista Championships. It is a resurrected species that the Holguin family of Finca Inmaculada saved, but is from East Africa. It possesses sugary sweetness qualities, similar to processed sugar - making it extra addicting!
Gesha - A high-scoring coffee, Gesha also gets used at competition a lot, and is a species of Arabica. People are addicted to it for its cup quality, and the fact that it tastes like jasmine flowers and tea. It is also notoriously expensive, which gives it the fame that some of mainstream consumer audiences have given attention to.
Wush Wush - This Ethiopian coffee is another high-scoring variety, having earned 96 points by the Coffee Review Scale! It is considered an exotic variety, low-yielding with constantly changing tasting notes depending on where it is grown. However, Colombia produces much of the Wush Wush out on the market today, but it is actually from Ethiopia. What's so addicting about it is that it has especially sweet and complex flavors.
SL28 & SL34 - These hybrid varieties were a result of coffee science research at its best. Scott Agricultural Laboratories is responsible for bringing this variety to the scene, who cross-bred it with SL42 to produce the high-yielding SL28. SL34 follows a similar path by Scott Agricultural, and is also high-yielding. They are both Arabica varieties with above and beyond cup qualities, and while they are extremely susceptible to disease, they are more easily accessible on the market than other coffees, and for this reason are more affordable than the others mentioned.