Personally, with those components, I honestly don't see the sense in spending the money on a watercooling setup to begin with. Even my daughter's computer has an E6400 which is soon going to be an E8400 when I get my latest project finished. I think your money would be far better spent on more hardware and a good air setup. Air can be very quiet, and with those components, you could probably be as quiet or quieter on air than water. It just doesn't make sense to spend $250 on a watercooling setup to overclock, when you could spend that money and get more current hardware that would give you 4x the performance of your setup overclocked.
That being said, the way you get a quiet watercooling setup is to use a quiet pump, and lots of rad surface with slow spinning fans. About the quietest you are going to get in pumps is an Aquastream XT, which are not easy to come by stateside and are higher priced, or an undervolted MCP350. The MCP350 can be put on a rheostat to do so. And as was mentioned, you need to completely isolate the pump from the case. Petrastechshop sells a gel pad that is fantastic for this and only about 1/4" thick.
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