I play a wench in a medievel metal band, so I wear one everytime we have a show.  I have about 6 or so in my collection.  I have found for really putting smaller chest size up is ones with straps.  The renissance kind.  I really enjoy the lacing in the back, makes things look really good. 
I also did alot of searching on the internet.  I came across a little shop in New York online that has several sizes, styles.  Just go to a search engine and put in a color and corset/bodice and you wouldn't believe what you get back.  
The ones I have are all fabric and have run from $35 to $80.  I am gonna save up for a leather one next!!
I love them and wish I could get tons more!!
