Custom-printed playing cards?

I'm looking for a source for low-quantity custom-printed playing cards. Basically, I have a set of images that I need to rearrange and handle a lot, and I want them to be durable and look good. It's okay if the back side has the normal playing card design, but ideally I don't want the face side to have any markings except for what I want printed. It would be okay if the cards retained the normal suit and rank (value) markings, but I'd prefer not to have them. I want to be able to order as low as 25 decks, and it would be nice to be able to order just a single desk for proofing. Think of the military decks for aircraft recognition or for the infamous Iraqi most-wanted decks--I need a reasonably high quality, high resolution print. Finally, are there any options available for a slightly larger format than normal? (I guess a normal card is 2.5 x 3.5 inches, or ISO B8, so larger than that.)