set up a team development testing environment

Ideal for Microsoft Technologies is TFS (Team Foundation Server), which has all the features you want.
In case you don't want TFS, try this:
Version control system

• SVN
• Mercurial
• GIT

Bug Database / Project Management / Tasks

• JIRA
• FogBugz

Developers environment

• Dual screen
• Powerful PC
• Quality chair
• Whiteboard
• Free coffee

Development machine: Visual Studio  + VisualSVN/TortoiseSVN + Resharper
Buildserver: Teamcity
LAN testing server: Webserver with build by buildserver + DB with daily copy of live
QA/Staging depends on the project size.