Full deck is just a bad idea, imo. Compared to the chance of scoring an expensive card from New Bloods, I've found they pale in value (but then I've only opened a handful in comparison).
New Blood has offered me the most clintz for credits so far, if you go for them on or near to release day you can make a lot of money if you luck out.
Really though, there's no best deal, and everyone's going to tell you something different.
PS we should sticky a topic regarding packs and get mods to direct people toward that, seems to be a few threads every couple of days regarding this.
I used to buy Full Decks, but not anymore since I've pretty muched finished collecting the non-Cr collection.
I stick with New Bloods now. They pretty much always have the highest average valued cards in any given week - except when you draw a pile of Commons, but then, which pack aren't Commons bound to pop up in?
(I haven't bought a pack in weeks though. . .)