I never set a daily limit above $50 for my adwords budget, and i have never had any billing issue. Beware though, i know of people who had problems with Google Adwords billing department. Overture used to be the worst company, they didnt let you access your account during a week, but charged your credit cards for tons of unwanted clicks. Hopefully this changed.
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Napa Valley wine, wineries, on-line wine sales, lodging, vacations, golf, current events http://www.napavalley.com 
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