CanadaRox, I've resized partitions on the Perc 5i, 6i, and 6E cards using Paragon Partition manager 8.5 Enterprise Edition.
I've had no problems with it. I think they may still have a trial program. I could not get Acronis, and Partition Magic to work with those cards.
Does the trial fully work? Any limitations? I have a C: partition that's 25GB and D: partition that's 1.33TB need to give more space to C:
I also have a Perc 5i controller.