I have quite few Weaver Ultra Line freight cars, and the "bang for the buck" is unbelievable. Very good molded detail, and the printing on them is really good. Plus, they're relatively easy to convert to 2R.
My only complaint, if you can call it that, is that I find them rather light, so I usually add some weight.
They're reasonably priced new, but you can typically pick them up used for $20 and I wouldn't hesitate to do so.
Fred