I vote for diversify; but, I am the type of traveller that avoids western style properties like the plague

Bali is synonomous with Villas. I would suggest for the same or lesser cost than your current property, to consider: The Ahimsa properties. The Estate has a great location for the nightlife scene; and, the Ahimsa or Jimbaran Bay properties are excellent as well.

Many choices, I personally have a Seminyak villa; but, I think you will better enjoy the proximity to Kuta subject to your nightlife remarks. A little closer of a crawl