C# web application release strategy

I'm currently working on setting up a release strategy for our C# web apps.
All our source code is kept safe by subversion. My goal is to accomplish the following:

• Automate release builds of all our websites
• Create per-environment and per-server builds with relevant configuration (eg our staging servers and live servers log to different databases)
• Enable a simple installation of the latest builds to our remote live servers
• Be able to tell easily what version of the site is running on our servers
• Be able to relate the current installed version to a subversion number

My testing so far has lead me to some BATch files running MSBUILD over my sites and some NSIS scripts that compile all the files into a single EXE for easy installation. It's coming on well but I still have some way to go.
If anyone has any recommendations I'd love to hear them!
PS NSIS is fantastic! If you ever need to create any installers, try it!!