FP,

One more note, which doesn't help you make up your mind at all, it envolves the difference between the durability of the pavers vrs the Stamped Concrete.

Pavers do tend to stand up better over time. That is because of the difference in the way they are made vrs a poured concrete slab.

Pavers are formed under compression (as much as 3,000 lbs) in a hard mold. And then kiln cured. They can generaly withsatnd 3,000 lbs of pressure per square inch without fracture. A four inch concrete pour cannot.

Also the compression forces the materials closer together. This helps prevent spaulling, a common issue with poured concrete. And it is something that melt chemicals and salt will accelerate.

Something to consider, given the Chicago climate.