Or - "That's an interesting comment....

"That's a good question....

"I'm glad you asked me that....

(the last 2 are particularly beloved of politicians) LOL! What they really meant was:

"That comment you just made sucks! It proves what a jerk you are."

"You bastard! Why'd you ask me that question? Wait while I figure out how to maneuver my way around it...."

"I wish you hadn't asked me that! Now observe as I avoid giving you a real answer."