Very true, if I later sold on the block it would be easier to do so if it used hose barbs. But those compression fittings look so very cool!
I'm planning on purchasing such a whopping great radiator because I plan on cooling eventually two or three PCs from it

In addition, it's not going to go inside my case but in a separate 'box' so the size isn't too much of an issue since my case has room for only the smallest 80mm radiator which would need a lot of airflow through it to cool two Xeons and the gfx card.
Will get the smaller Eheim, since I hear running the 1250 with 3/8" ID barbs could cause it to become a bit hot (I believe it comes with 3/4" and 1/2" fittings as standard).
And Tygon looks good, although I hear there are issues with it not working so good with push fits?