(This is not precisely how I would do it, but) "I think that's a great idea and it accomplishes our fundamental goal here, so let's do it."
Any student of management will immediately see the usefulness of this statement, that part is obvious in theory, but there is an important subtlety in practice that is make or break:
It's not always evident to people on what level of abstraction the 'fundamental goal' lies, but if you can get it right on a regular basis, the world is your oyster.
The line at the top is an open source management tool, free for all to use as they see fit :)
Oh, yeah - you needn't say the part in parentheses out loud.