An Eheim 1048 is plenty of pump for your setup. The stronger pumps that people are recommending will do very little to lower your temperatures by much at all. I designed the WW with the 1048 in mind (I owned one). They are a very good match in a single block system (i.e. Eheim 1048 + WW + radiator).
Given your CPU and its heat load (speed/voltage) and pump I would anticipate full-load CPU temperatures of around 13-17C above the water temperature (depending upon the actual programs being run).
Your radiator is relatively small, and you'll probably be getting around 5-6C water temperatures above ambient.
All up, I would expect around 18-23C CPU temperatures above ambient room temperature under load (again - depending on what you're doing).
Of course, the issue you're probably really running into is believing other people when they report CPU temperatures of, say, 5C above ambient, or some other crap like that. Fact is many motherboards report temperatures very erroneously, and even motherboards of the exact same type/make/model can vary quite widely.
You can really only make comparisons with stuff that is applied to your own personal system, and attempting to use other's results will only cause frustration and confusion, because others simply cannot be trusted, not because they are dishonest, but because their motherboards cannot be trusted.
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