The UAE has an impressive fleet right now. 80 Block 60 F-16s and 70 Mirage-2000s. When I was in UAE, I used to pass my time imagining what kind of destruction the PAF could deliver with that kind of fire-power.
If the UAEAF lacks anything, it is one very sophisticated dedicated air-dominance fighter, which could easily be the F-15 (which is app. $42 million each compared to Rafale $60+ million and Eurofighter $55 million). With their relations with the US, the F-15 would not be impossible to get. But, the Arabs are not known for budgetary discipline, they may well go for the more expensive and capable fighter, even though I can't imagine what they may possibly need it for.