Mona Lisa, Capriccios, It Rains Fishes, La Guernaca, Plazita Limena and as someone mentioned Cactus Blue are all great, hard for me to pick a favorite but if I had to it would probably come from Capriccios, It Rains Fishes, Plazita Limena or Cactus Blue. Average food cost PP for entree is probably around $14-$19+ depending on what you get. These are all places I would eat at regularly if they were back home, they can stand with any good Los Angeles restaurant.
Pasa Bon has surprising good pizza for an island, definitely worth a trip, a medium and a salad will feed two.
I would not go back to Donna & Georgio's. Some people really like the place and maybe it was an off night when we were there, but I thought was very average, probably below average Italian food. We wouldn't ever eat there if it was a place back home, way too many better Italian places to choose from.
I haven't tried Unbelievable, Wil's or Bobbie Jans yet but will someday based on the many recommendations they get.
You didn't mention Casbalanca, they have many fans but I thought the food was very very average.
Bonaire has a surpising amount of excellent restaurants, more than you can try in a week. Probably the consistently overall best food of any dive location we've been to including Grand Cayman, Curacao, Ambergris Caye, Cozumel and Dominica.