There are lots of good fuels, all depends on how much nitro you want to use and the country you are, sure shooters are various: O'Donnell, Maxys, Roga, RB, JP/RunnerTime/Spark (all three fuels made by the same: Passerini).

Good fuels are various, you only need to see what fits more on your pocket and which ones are available on your LHS.