SIA first class cost - in the range of 15~20K (depends on
distance)
SIA raffles class cost - in the range of 7~11K (depends on
distance)
Business class has generally 3 main courses: appetizer, main course
, dessert.
Plus you get appertif before and drinks of your choice later.
Basically, they are very well taken care of.
No you cannot self order food. You can do thet on 1st class i
think.
Still, bus class is damn comfortable. Reclined seat, huge variety
of shows, too much food....well, it's class.