I also read over all of the user reviews of this product @ that link on New Egg. One interesting one to point out is the guy that discusses aquatic gear, and his findings about the tubing and other elements in some Computer Water cooling systems coming from the Pet/Aquatic cooling systems. So, Industrial Quality pumps/items for large aquariams is another avenue to investigate. Perhaps cheaper. but definately would open up more options.
It's kinda hard to tell what the system'll look like, since all but the pump will be homemade.
We'll be using a radiator from a car's heating system and some 1/2" tubing. The cooling blocks will be made of raw cobber and it'll be cooling memory, northbridge, cpu and gpu.
hardrives will be in a seperate enclosure so they won't need water cooling
Edit: we may be using 2 rads or a rad and a reservoir (sprinkler container or something)
Also one thing to add, the RD-30 is going to require a seperate power supply if you decide to go that route. But wow, 33 ft. of head that makes me smile. The MCP655 dumps more heat into your loop than a modified MCP355 will. I would go with either an Alphacool top or Petras top (thats what i have).
Visualize each pump out on your lawn side by side with only the inlet connected
Turn each pump on and water will shoot straight up in a vertical column.
The mcp655 will shoot 11 feet in the air at zero psi where the column from the mcp355 will be 20 feet at zero psi.
Although psi and gallons per minute are is part of the equation the efficiency of a pump is actually measured in flow rate or head of pressure.
The difference between the two pumps will not be noted until the loop reaches its highest point of restriction.
With multiple high end water blocks and large radiators the mcp355 with the modded top would be the better choice.
Even with this information the mcp655 is no slouch and a very good pump except it seems to dump heat into the loop on its highest setting (adjustable models)
The only thing I would question is at what rating will the mcp355 be with the larger barbs?
May be when I get a lawn I’ll try this