Buying anything because your "adrenaline is flowing" is probably a bad idea.
Cool off, think calmly and clearly about your reg and ask yourself why you are the first one to be making a grab for it. It may be only $30 and in your budget to not care about if you waste the money, but a bad reg can still be an opportunity cost of possibly not buying an actual great name that comes along.
Some of my worst reg's are from when I thought I'd found something great, got excited and bought quickly.