I have been using some of the ceramic bearing 2 or 3 phase brushless pumps with good luck. They are suppose to have a pretty long service life and are efficient.
I buy the 24v rated and run them at 12v
High flow and high pumping height;
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Lower flow and lower pumping height;
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
You want to mount them with the shaft at a horizontal orientation for longest life. I blew up an external controller due to an incident of water running backwards in the pump at a high elevation and was able to replace it with an cheap ebay controller very easily.