It would be great if a well established company like Iwaki or Panworld offered something suited to our application. I know Panworld already makes a number of DC pumps, but they are on the small side & not biased for a lot of head pressure. Or perhaps an innovator like EcoTech could come up with something? After all, they're really the first company to offer decent DC power heads. Wouldn't be cheap, but you could be assured that some proper R&D goes into the product.
EDIT: Ok, maybe I need to retract my statement about Panworld only making small DC pumps, it's been a while since I did a search on the product!
http://www.panworldpump.com/products_03.php?cs=3&ss=18