I use the active aqua pump lunarman mentioned, I run a 15 or twenty foot intake tube for it and it cuts the sound way down. It has a large main line with a 8 valve manifold, I am currently running 5 stones on it, but I see no reason it wouldn't run all 8. It puts out a lot of air. I mounted it with rubber gromets to a board, and put felt strips under the board for farther vibration resistance.
the old one I used was also active aqua, and it was a cheap ass version of the Danner that Bushmasterar15 is using. It was acceptable, I bet that Danner is a good one too for 35 bucks, can't beat that. My good one cost about 100 I think.