I've found this to be an unpopular choice, but I'd like to vouch for Photoworks San Francisco - photoworkssf.com
They've processed all my color film from the last three years with excellent results, even though their prices have gone up a few dollars in recent years. I've only ever had two issues with them, and they were extremely friendly, courteous, and personable as they resolved them in no time at all. Recently my film had been lost in the mail due to a damaged package (fault of USPS, not them) and the owner wrote me a note of apology and gave me a free roll of film when they managed to track it down and get it on its way to me again.
They are dedicated to film, which is why I continue to support them.