Verdana is good but I'll go for Century Gothic. My fave! he he.
For body text?...
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My personal preference for a casual yet elegant sans-serif display is Helvetica Thin for your headers and Lucida Grande for your body. However, that's personal taste, and worse, most people won't find those fonts on their computers (especially HT--I don't have it on mine, I can't find a free download, and I won't pay for it ).
Default sans-serif for me is Verdana. I like those new Microsoft sans-serif fonts but they're not in widespread usage.