I agree with HillRider about Mavic CXP33 rims. They're 40-50g heavier (each) than the Open Pro, but have a sterling record for durability and quality control. The Open Pro is a very nice rim, but is simply a lighter rim that won't be as durable at the extremes of wear. (I run an Open Pro on my rear wheel with 32 spokes, 14/17/14 butted, but I only weigh 180# and the wheel is perfectly-tensioned.)
__________________
"c" is not a unit that measures tire width