Until this past month reading all of the positive things about connections hopper passes. I think I'm going with these now.
Also, my cousin just obtained tickets through mousesavers.com recommendations--Mary Waring only recommends two places for obtaining these tickets from sites she feels are reputable-- one was ticketmania.com, which my cousin just purchased her hoppers through. They arrived Federal Express in less than two days with a total of $7 shipping charge for the entire order. The discount was more than DC, but less than Connections (8% maybe?).
Remember to keep your receipts and copy the hopper passes in the event of theft, loss or damage.