There is no such thing as a concrete slab that does not crack, rebar and compaction or not. A good job simply manages the cracks in a manner that is acceptable (relief cuts, stress joints, etc).
I like pavers for a different reason. With 1000 SF of area, you are impacting the ability for water to be absorbed fairly significantly. Pavers will permit the water to leach into the soil, a slab will create runoff.
If you are going to use concrete, at least look into water permeable concrete.
Used bricks and pavers have more chance of heave than concrete if you are in an area where freeze-up is an issue. I'm not a big fan of used bricks for a floor surface. If you ever throw the kind of a party where ladies might show up in heels, used bricks are aggravating to walk on in heels.
You can decide for yourself if that comment came from personal experience or not. 