Diametric,
You seemed to have dismissed Sosua and Cabarete for some reason. Yet in many ways these fit your requirements except perhaps for #2. For No 2 , there is the Choir, the North Coast players who recently did some short sketches in a Cabarete restaurant and have a season of shows. Maybe you have ruled these areas out on price as these areas can be expensive.
Sosua has the Jolly Roger which is spook central for the Canadians, and many Brits and has bingo , darts, quiz nights etc.
Sosua also has some excellent medical facilities and the international school.
Harleystock I think made the mistake of buying where it is relatively cheap out in Las Canas near Gasper Hernandez without due consideration of the security aspects. This is an area way beyond Cabarete.
Puerto Plata has some nice areas and good supermarkets but unless you can get somewhere in the Secure gated communities the safety aspect is dubious.
With regard to Electricity make sure you are looking in an area which is on an "A" circuit. this will have about 23/7 but you can make the electricity situation manageable using invertors and /or generators. Internet is another problem but this is slowly going away as it improves. De Lancer is pretty good and has cable too in the Sosua area as I recall you said you need to use it for work.
I am sure you have looked at DR1 extensively and know the areas that might be good and secure so perhaps you should reconsider Sosua and Cabarete.
Olly and the Team