With the Z3100 RIPS fall into one of two categories. Those that use the HP color separation tables, and those that don't. EFI is an example of a RIP that does. Onyx does not, and I have not been happy with the results. GMG also does not, but they aren't strictly ICC based, and so they are able to produce nice results. If the RIP uses the HP tables the results should be very similar to what you get from the driver. EFI has a new low cost rip Color eXpress. I like it a lot but your dependent on their profiles, which vary in quality. I'm guessing your look for the RIP because of the size issues rather than any quality issues. For photographic work the drivers are going to generally produce the best quality. My experience with rips that support the Z3100 covers EFI, GMG, and Onyx. Out of those the first two will get you there quality wise but your talking fairly big money. I would look into Ergosoft as well.