ck hubs are probably overkill, but if you like them there is no reason not to run them. 36/36 would be the most bombproof (obviously) and would only be a little more- 4 spokes and nipples worth, assuming the rim you want comes in a 36 hole drilling. you SHOULD need a 135mm hub (if im not mistaken, the 150 is more for downhill bikes)
i have yet to see the sun cr-18 be used in heavy cyclocross, but i love them, as does the lbs. cheap, durable, traditional box rim that's a little bit wider than the open pro.
salsa delgado cross is also very durable, and a bit wider.
you can't go wrong with a open pro, cxp-33, velocity (insert rim here). they have all been tested by time and there is a reason that they are strongly recommended, but anything strong laced with 36 spokes and a 3 cross pattern isn't going to be "weak" as long as it is built by a good builder.