hehe, been burned by the och pumps? i could see it in your sig too
someone over at sharkyforums has been running his dtek for over a year now, and i think una has used something similar, can't remember if it was a rio though.
you can just purchase the reservoir from him, have it predrilled, and then put in your own pump. that's what i did. people have said the via aquas were better, so i bought the res from him for $25, and purchased my own via aqua, 480 to be exact. it barely fits, but it does. it is quite strong too, we'll see how it performs.
i think the rio's are just too problematic, maybe they need to be run submerged, but i'll tell you this: danny is a great guy, and is not stupid. if these were failing that frequently, i don't think he would keep selling them. OCH/CPUFX yes, cuz they are scam artists in my opinion, but danny is a straight up guy. give him a call and ask him the fail rate, he is a great guy to talk with.
btw., where did you get that K4.1 block? those are beautiful if i recall correctly.