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Since you have time to investigate before switching, take a look at PageKit, a very complete Perl app server that gets little mention. It does a lot and I have worked with it on a large production site. Yes, it's free and Open Source.
http://pagekit.org/
"PageKit® is a mod_perl based web application framework that uses HTML::Template and XML to separate the Model, View, Content and Controller. Provides elegant solutions to many difficult web programming problems, including session management, language localization, authentication, form validation, and co-branding."
If the app is really for admin use only, and artists will not need to do updates, then there may be nothing wrong with here documents. My ASP app has around 300 UI screens that are basically database-driven tables using here documents that use multiple CSS stylesheets for handling different themes and cultural appearance. So far so good after 3 years.

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