Hmm, from my experience Chantelle cups run a tad bit small so you shouldn't have that cup issue San. You should just try them on and see.
Sorry I can not recommend a good strapless bra right now. After learning I've been wearing the wrong size for years I am in process of slowly rebuilding my bra wardrobe and strapless is still low on the priority list. I have heard good stuff about Le Mystere Shameless strapless bra, but with that brand people either love it or hate it,the nabds tend to be a bit tighter. Websites like Figleaves and Herroom have a lot of bra reviews, like Zappos does for shoes. here's the bra:
http://www.figleaves.com/us/pr.....769-front#
For everyday wear I have bought the following ones from Chantelle ( all have just a touch of padding):
http://www.herroom.com/Chantel.....-Bra.shtml
http://www.herroom.com/Chantel.....-Bra.shtml
http://www.herroom.com/Chantel.....-Bra.shtml