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rpm has basically everything covered.
But if you want the absolute best. Go for the PA120.3 Rad. If budget is lower, the MCR320 is great bang for buck rad.
If you're wanting to cool the nb (which isn't necessary really, just have a 40mm fan blowing over it), you'll need to buy a mosfet block as well since the two are interconnected. You can always dremel and break the heatpipe.. but not many people are willing to do that.
Mosfet block
Here is a universal nb block for the nb if you're wanting to cool it
Universal northbridge block.
or a full cover block
Full cover block
Then of course.. you'll still need tubings, barbs/ compression fittings or res/t-line.
EDIT: oh and i almost forgot about fans. You can use yates loons for a low budget build, or if budget is higher. I recommend the 1850rpm gentle typhoons. I have three of those and they are amazingly quiet for the amount of air they push