Friends are staying at the Riu Antilles with an all-inclusive package (they didn't want their boys - 20 and 22 years old - drinking and being charged by the glass... so the all-inclusive was to prevent any sticker shock upon depature) when we're all down in February (we're staying at a villa).
Not sure when you're going but I'll update based on their feedback... they'll be very honest... after a few Patrons.
I am unsure which you'd consider the best......Tamarijn may be the most inexpensive.
If you are looking for Hi Rise action (lots of activities and people) then the RIU or Occidental may be the way to go.
If you are looking in the Lo Rise, (a quieter area) the Divi AI, the TAM and Amsterdam Manor may be to your liking.
We love the Tamarijn, Yes it can be rocky at times, but you can just walk out of your room and you are on the beach. The fact that it is an AI resort does not affect our choice, we love to just walk out on the beach, since that is what we do from 9am ish until sunset. We loved the food at the reservation restaurants, the buffet was okay for dinner (never tried it for lunch), and we loved the BF buffet. I would love to do the tamarijn on a NON AI status b/c like many posters said there a tons of great places to see and eat.