Try this thread, there is a lot of information about ED class.
first time in EVA delux...what to expect?
Also try the search engine as it works quite well looking for information on Evergreen Deluxe Class and Elite Class.
There are business class fares from BKK to CLE on KE, DL for about $ 1,450.00. You would just have to purchase a ticket from SIN to BKK which are very cheap.