I'm sticking with 2.2 since most current resources suggest that and I don't have a printer, let alone custome printer profile. lol
"During the calibration of your display, you will need to choose gamma and white point settings. The correct choice depends on how you are most likely to use your images. The best rule of thumb is this:
Unless you have a color management expert instructing you otherwise, select a 2.2 gamma and a D65 white point.
Because Windows PCs use 2.2 gamma, images edited in the traditional Mac 1.8 gamma will appear incorrectly to most viewers on the Internet—this of course means that your Mac friends need to switch their displays to 2.2 gamma when perusing your 2.2-savvy work. Mac-using photographer Gary Ballard maintains a handy demonstration of this phenomenon here.
Labs and Internet-based services using the RA-4 wet process, such as in a Fuji Frontier minilab, almost universally expect you to use a 2.2 gamma in the sRGB IEC1966-2.1 color space. That's true for services such as Pictage, Smugmug, and Shutterfly."
http://support.apple.com/kb/HT2026