I am looking for a simple note taking tool for, with only requirement for backing data, and code highlight support
I recommend CodeBox. Simple interface with support for syntax highlighting, sync with Dropbox and etc.. Available in the Mac App Store
The PearNote app is one I can recommend with no caveats. It is simple, beautiful and powerful.
You don't have to use all of its features, but they are there if you ever wish to add audio or video.