What would be the best language to accomplish windows file manipulation?

Question

First, I'm stunned I can't find a single program out there that can do what I'm about to describe. There are some programs that can do parts of this, but none seem to do it all and do it well.

So, I'm thinking of a simple GUI interface where you can import a list of files from the same directory containing pictures and videos. Then it would rename pictures with, if available, the information in the "date taken" field. If this isn't available, then the "date created" field or something like that. Similarly, videos would be renamed with the "media created" field information. So this way, all pictures of videos would have a standard name format that would allow you to see them in chronological order.

Again, I've found some programs that do some of it, but they don't do all of them and they don't really do that great of a job or they make it WAY too complex. I've tried Namexif (works with *.MOV, but not .MP4/.MPG) and I've also tried Advanced Renamer (too complex and doesn't work well), Bulk Rename Utility (too limited), and a few others.

So I mostly know PHP and a little Javascript...I doubt either of those are good choices. I used to know a little C# which may be decent, but it's been a long time.

So the question after this long rambling is, what would be the EASIEST and best programming language option to accomplish this? It needs to be able to rename files (or copy as) and read file metadata as well as some way to make a simple GUI to open a directory, have selections for running the change, etc.

Thoughts?