I'd go with the silent if I were you. Here's a diagram to help you with fan placement: http://i4.photobucket.com/albums/y132/picco26/New%20Computer/IMG_20110712_165420-1.jpg
If you buy a 240mm radiator water cooler, it should come with fans unless you do custom loop. You can replace the fans on it though and if you did, they should probably be silent edition too. But on the topic of cooling, I'd recommend a Noctua NH-D14 or Phanteks PH-TC14PE over a water cooler for price/performance ratio. If you want a good, cheap cooler then a Hyper 212 would be great for a light overclock.