I highly recommend Tamrac. I recently purchased a Canon PowerShot G11 and got the Model 5692 for it. Best camera case I've ever owned. Tamrac makes LowePro, CaseLogic, and other big box retailer offerings look like weak sauce.
Tamrac's are water resistant, heavily padded, offer heavy duty materials, and have a 5-year warranty. For your camera, you'd probably want to look at the Tamrac Model 5691 or 3585. See below for links, or click on the following for a sizing chart: http://tamrac.com/digitalcamerafitchart.cfm