I'd like to offer clients the option to customize their sites, however. How would you go about setting that up? Would you build a CMS for multiple users on the

I'd like to offer clients the option to customize their sites, however. How would you go about setting that up? Would you build a CMS for multiple users on the VPS or use a prebuilt solution? I was thinking about S3 because it'd serve their sites quickly, it'd be secure, and I could build a simple front end pretty easily. What do you think?