Making a web player frontend for my media server

I have a small media server. It's actually a Netgear GoFlex Home (NAS) running Plugbox Linux. It's currently running a bunch of servers HTTP/FTP/WebDAV/DLNA/Webmin etc and I want to create a frontend for my multimedia that I can access from the internet. (I preimarily use it as a DLNA media server).

At first I considered using a Java Servlets backend with a Flex based frontend but that fact that I can't use Flex Builder from work (licensing) and I'm unwilling to pay a few hundred pounds for it, that's out of the question.

After reading a bit, I'm now considering HTML5 frontend, maybe the backend can remain Java Servlets under Tomcat?

Anyone have any suggestions on what might be best to achieve the desired goal?

Thanks

You can use Flex as front end without using Flex Builder, as Flex SDK is open source,
you should try building with Maven, it's easier to build your projects using maven