Fiji was beautiful. Yes it's worth it. I live in Boston, so I can understand your apprehension about traveling 8,000 miles.
I did my diving with Kai Viti Divers. They run like a Swiss watch. The diving is superb. The boats aren't too crowded. Wananavu is a very nice resort. They were booked when I visitied (I stayed at the Rakiraki hotel). I did my diving here for two main reasons. First, I wanted to dive the Bligh waters. If this is your first Indo-Pacific diving, you will be astounded. Second, I didn't want to deal with inter-island flights. Wananavu is about a 2 1/2 hour drive from Nadi. Transfers are usually arranged when you book the hotel. This is real easy.
When you get back to LA, stay overnight. All flights coming back from Fiji are red-eye flights. The last thing you want are two overnight flights.