Be careful about the As Seen On YC link - my first impression was that you were in a YC class and it's really you submitting your own post to hackernews. Seems a bit sketchy to me...

I actually like the old design better. It has more character with the cartoon guy and the video. There is a pleasant color scheme vs a full screen stock photo of a mailbox. Maybe try incorporating the envelope input box thing with the some elements from the older design; the new design seems to be missing the human element, which seems important since the business is about people buying something for others.