I want to only allow my system admin profile, the ability to move certain stages

Hi Guys,

I have been trying to create a validation rule that only allows my system administrator profile to moves certain stages in a pick list, i tried using the below validation rule, but it then locks all the fields on the page unless you have the system administrator profile, any sugestions guys would be great,

ISPICKVAL(StageName, 'Client Trading') && $User.ProfileId <> "00e20000000rJKQ"