1up, Kuat, and Thule all make good tray/cradle style racks. You'll not go wrong with any of them.

The only thing I can add is an observation about the 1up rack that is pictured above: the swingarms that hold down the wheels are entirely made of metal -- aluminum, I suspect. Sturdy and light, but not fender-friendly. I have a Thule (I think it's an XT Pro T2, or something like that) which has sturdy plastic swingarms, and the parts which clamp onto the front wheels are also plastic and rather broad. They work fine on a fendered bike, and then the rear wheel is held down with a ratcheting strap.