Biggest space gobblers for SSD's ..
The Windows Update folder @ c:\Windows\SoftwareDistribution\Download - Use junctions and point to D:\Windows\SoftwareDistribution\Download
Temp folder @ C:\Windows\Temp - Edit environment variable to point to D:\Windows\Temp
User Folder C:\Users - Best done on clean build, enable the admin account, delete account used during setup, edit regedit to change path of profiles to D:\Windows\Users, reboot, log back in as admin, create new user account, login as user disable admin account.