Datacolor User to User Support Group.

I'm trying to profile my epson c2800 color laser. Unlike my epson 
inkjet r1800 which I can totally disable the color managment. For 
c2800, I can select [no color adjustment] under [color control], 
however, there is an option where I can choose 1.5/1.8/2.2 gamma value. 
The result can be very much different. Somebody suggests me to choose 
[icm]. Which is the proper way to do it? Tks