Antigua has little to offer that you won't find in St Maarten. And it isn't as nice.

St Barth is easy and can be done on the cheap if you are careful
You will book with the airline direct. St Barth commuter or Winair

Saba is amazing and such a different experience. Hardly feels Caribbean.
Winair wil take you there to land on the world's shortest commercial runway.

Hope this helps.