Wow, the Chok Sulee is going to Lembeh - she's a good boat I have been on her 3 times, you should get a really good deal on her - I got 4 day (diving days) in the Similans on her for 12,000 Baht (about 280 US$) - Seree gives great deals.
There are quite a few Thai boats heading off to Indonesia these days during the off season - they used to go to the Thai Gulf but L/aboard is a bit of a waste of money in the gulf. I will post more info and prices as they are released locally.
