I cant speak for the XSPC but I would recommend you go for the NexXxos UT60, if there is enough room and if youre willing to pull out the dremel here and there, I would rather a Monsta 240. If youre planning to run a CPU/GPU look, and a single 240 you might want to look at a very efficient radiator. If youre not afraid to do some light modding, you will easily fit a 360 Rad into that.
Currently I am running a 3930K and GTX 690 on a single GTS 360 and I have to say that temps could have been much better had I gone for a thicker Rad. With the system fully immersed into a game, the graphics quickly heat up to 60-62, and water temps seem fairly on the hotter side of warm. I will be adding in a Monsta 240 in the next month or so.
Cant really help you on the barbs tho. Hope this helps!