Those products you listed work fantastically. Why change what isn't broken? Also it's not the job of AD, SQL, and Exchange to be exciting it's their job to work well. As a network admin there's nothing that can come close to Exchange, and we looked for fun before upgrading from 2003 to 2007. AD makes administering the network a breeze. All I do when we purchase a new PC is add the PC to the domain and reboot twice, all the software it automatically deployed and all the patches/updates are automatically applied.
For Windows 7, I use it at home along with OSX and both are great products and both have their issues.