Which pump?

What do you think DDC 18w or a D5? There will eventually be a cpu block, NB block, video block, and a swiffy 120.3 rad.

I believe the DDC 18w with a top would out perform the D5, but in most loops now a days, as long as you're above 1.5gpm performance doesnt matter. The D5 is a more reliable pump, you very rarely hear of a D5 failing, unlike DDCs.