Also be warned on used ones - these have a halogen lamp inside that does (like any incadescent lamp) start to go off color over time and will eventually burn out or fail to pass certain self tests. Once it goes you have to ship the unit off the get relamped which runs about $250.00. Ours is nearing the end of it's bulb life now....
Also should point out - if your RIP has profiling built in (Flexisign Pro does for one and I think Onyx does as well) you only need the Eye One device itself. In other words the Eye One basic package is fine...