the TORO 570 spray heads are what i use, and they are specifically designed to work for low pressure their best performance is at 20-30 PSI. They have the "easy up" riser, which pops up with out much force, and a "no flow by" seal on pop-up so water wont leak out of the head on pop-up. I would use the 8' nozzles on those....if you dont want 570 i would go with the Rainbird 1800 series spray (bhungue: the 5000 is a rotor)
Thanks
Ray
Rays Above and Beyond Automatic Lawn Sprinklers