As far as the difference its probably only quality and slight difference in shape. I don't know anything about 1/8. Velocity makes a decent rim.
I'd go with the Salsa Delgado Cross, they are a lot lighter have eyelets and are plenty strong. Get 36 hole ones and I would doubt you would have a problem. You will also have to worry about cross winds with those 42 or 43mm rims. In the winter when there are no leaves on trees you might get tossed back and forth a lot.