i use the following

SELECT sp.name AS ServerPrincipal,

sp.type_desc AS LoginType,

CASE sp.is_disabled

WHEN 0 THEN 'No'

WHEN 1 THEN 'Yes'

END AS UserDisabled,

sp.create_date AS DateCreated,

sp.modify_date AS DateModified,

sp.default_database_name AS DefaultDB,

sp.default_language_name AS DefaultLang,

sp2.name AS ServerRole,

sper.permission_name AS Permission

FROM sys.server_principals sp

INNER JOIN sys.server_role_members sr ON sp.principal_id = sr.member_principal_id

INNER JOIN sys.server_principals sp2 ON sr.role_principal_id = sp2.principal_id

LEFT OUTER JOIN sys.server_permissions sper ON sp.principal_id = sper.grantee_principal_id

where sp.name <> 'sa'

ORDER BY ServerPrincipal, ServerRole