sorry your link doesn't work for me so can't see how you plan to set yours up, but to answer your question it doesn't really make that much of a difference whether the fan is pulling or pushing air through the radiator from the inside to the outside of the case, same as it doesn't make much difference between pulling or pushing the air through the radiator from outside to the inside of the case.
other things play a factor in how you might choose to set things up, like case design, rad size, whether you want negative or positive air pressure in the case, etc. etc.
yes you might get slightly lower cpu temps drawing air from outside to inside the case but then you are also increasing the heat inside the case, which might effect other things like the motherboard temps depending on what other case fans you have.
personally i try and have the air flowing from inside through the rad to outside of the case with an extra case fan or 2 blowing air into the case for positive air pressure to help lessen dust build up inside the case.
just remember there really is no wrong way to do things as long as the case/ motherboard temps don't get to high, usually the cpu temp differences are negligible so i really wouldn't worry about it just as long as you don't have any problems elsewhere.