The Eheim's are very quiet, but I think you're head pressure requirement takes them out of the running.
The flowstar's look a lot like the Red Dragons, and if they behave similarly as well, they won't cut it either. They look like the high-flow, low-head variety, which is pretty much the opposite of what you want.
You'll need a pressure rated pump. I've had small iwaki's and while they do hum, it's not too bad. I'm pretty sure it would be quieter than what you have though.