Hope rotors avid juicy calipers. . .possible ?

how yas need a bit of advice on compatibility with hope rotors and avid juicy three caliper's, when i originally bought my brakes i got the rotor size too big so im lookin to downgrade to a smaller size so i seen these on CRC http://www.chainreactioncycles.com/M...?ModelID=16457 and they look pretty snazzy for the price and all that so yeh basically can anyone shed some light on the situation cheers boys !:)