The setup will not be all that demanding, it'll probably (not bought yet) be a heather core from Dtek and one of Fixittt's Copper Spiral Blocks (He got Dtek to sell them for him)... I am aware that the Grundfos pump would be insane overkill, that's why I wanted to run it at it's lowest speed (at which it only draws 30W).
The reason I was concidering it is simply the fact that it was cheaper than my first choice, the Eheim 1250 which I (since I haven't been able to locate it here in Denmark) would have to pay about $5 more plus shipping for (ordering from Sweden)...
Thanks for helping by the way
EDIT: Kinda forgot to mention that it probably will be cooling a palomino...