Hi,
I suppose Gemma or Freogirl will comment about "must see" items in Lombok.
Looking at your budget, I would think you would get a comfortable (A/C with breakfast) accommodation for no more than $50. Then you can rent a car with a Driver and explore Lombok. In the evenings you can have a choice of restaurants in Sengiggi as well as go to the clubs with ear splitting music. With a car you can visit Kuta to enjoy the pristine beaches. If you have a car, you can have tea and home made cakes at "Ashtahari" at an elevated place overlooking the Kuta beach. On your way to Kuta, you can visit a village where sasak weaving is on display.
Lombok is a type of place where it is entirely up to you how you want to spend the time. The environment is incidental and you are in the driver's seat to enjoy. If you spend the time from within a tourist cocoon, you will miss a lot.
Have fun.
Josi
www.webshots.com" border="0" alt=""/> Visit some of my albums (jhillary) that will give you a feel for Lombok.