Roger Smith , Jan 28, 2008; 02:05 a.m.
I'd keep the gamma at 2.2 and try to knock the monitor brightness down as far as the calibration software will let you. I use an Eye-One as well and used it on a LCD at work.
I'd also send them a 21 step greyscale patch (do a search) and have them print it. Hold it up next to your monitor to see how it differs (and if you only plan to print there, readjust your monitor to match it).