I've never seen the one you posted above, but it reminded me of the ECO C240 Dual Head - I had completely forgotten about it. So yes, I suppose it could be a cool experiment if you get a couple h50 units on the cheap.
I'd definitely recommend a triple radiator though (the criteria for which should probably be minimal pressure drop). Check out the Thermochill PA120.3 first or a XSPC RX360 second. Both have very low pressure drop and excellent thermal performance based on the Skinnee Labs' triple rad comparison
. I don't know how those pressure drop numbers look compared to a standard 30mm thickness rad, however I'll look around and see what I can find.
EDIT: looked at the XSPC RS360
, a standard thickness rad, and it actually had slightly higher pressure drop than the RX360. But it's also about half the price and you'll have a much easier time installing it if you're limited on space.
Edited by cmeeks - 9/3/10 at 6:19am