I bought cargo carrier last year. It was very hard to find the right one for me. I was looking for something that it looks nice, that is made of good materials... I was looking for something that I can use for a long time. Also, I was looking for something that has reasonable price.
So I bought Thule Force Cargo Box. It was a bit pricy for me at that moment, but I didn't regret. It's really good.
After a couple of months I saw a review of rooftop cargo carriers on some website and I saw that is Force Cargo Box is ranked as best one. That was final proof that I didn't made mistake when I invest in this.