"I await with bated breath your hasty response to my humble missive, and my joy shall no know bounds upon the receipt of the words of wisdom which I do most assuredly expect that it shall be composed."
Kind regards from me. Or regards if its not so friendly. If its a friend I often just use my initial J. I do have a set 'signature' on my emails which is my name, my affix/breed (kennel name) and a phrase 'because life's too short to show an ugly dog'. When replying instead of Hi or Dear xx I tend to put 'Thanks xx,' and then go straight into the text.