@Quero sounds good
I've been looking more closely at

Menjangan today - and it's expensive! Where are you planning on staying? Who are you diving with?
Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
Hi Russell I'm in Tulamben at the moment. Can really recommend Liberty Dive Resort. Liberty Dive Resort (Tulamben, Indonesia) - Resor Khusus Ulasan - TripAdvisor
The diving here isn't as good as it was a week or two ago, but still 15-20m viz most days. Diving here is really effected by the wind/swell.
Here's some short vids I made a couple of weeks ago in Tulamben:
Humphead Parrotfish, Scuba Diving at USAT Liberty, Tulamben, Bali (16m) 07/05/12 - GoPro HD Hero2 - YouTube
I would go Amed or Tulamben (or both). I'm going to Amed next week, will let you know what the conditions are like. PM if you'd like more details about anything (I'm from the UK also!)
Cheers,