Not always a space following a comma, and single quotes are okay anywhere. I gave up and wrote it in PHP. Don't have awk installed, don't feel like installing it, plus with PHP I can do some...
Yes, there is a great doc (http://www.linuxtopia.org/online_books/linux_tool_guides/the_sed_faq/sedfaq4_005.html)out there that discusses parsing csv files with sed, and this topic has been covered...