Latex plugin for visual studio 2010

I do not think there is anything available for VS.As an alternative, I use eclipse with the texlipse plugin. It has all of the features on your list. I do not use windows but ubuntu with eclipse, R, MySQL and Sweave is sufficient to cater for all my data connection, management, manipulation, analytical and reporting needs. All the tools listed are available on Windows with sufficient connectivity to SQLserver with RODBC.

I do not think that there's anything that comes close to what you want to do. But as far as I know, you can - in principle - use Visual Studio with any programming language. If you have enough time to configure it properly.

You can create your own LaTeX-specific language service. Moreover, you would have to create own build rules.

But since I think that is too much work, I recommend TeXnicCenter, a freeware program that has syntax highlight, autocompletion and error handling. I'm not sure about code folding, but I think it does not have this.

Another freeware is LEd (LaTeX Editor), that should have all the features you like, but as far as I remember, I was not that happy with code completion.

A good choice for a LaTeX Editor is TeXWorks. You should try it, since there is no LaTeX support for Visual Studio.