Syncing iPhone with one Mac but not another

I have a home Mac and a work Mac.
I want the iPhone 3GS to sync with my home Mac, and it does so perfectly.
Sometimes I'm at work and I need to charge the phone, so I plug it into the work Mac, and it launches iTunes and attempts to sync with it (which, if I let it continue, would erase all my loaded stuff). I always stop it manually.
I see the option in iTunes checked for "Always sync the iPhone to this Mac" (or something like that). If I uncheck it, it fixes this, but next time I go home, the iPhone doesn't sync with the home phone because this option unchecks itself at home too!
So how do I make sure it syncs to the home Mac, but does not erase itself when plugged into the work Mac?

From the user guide, page 16, http://manuals.info.apple.com/enUS/iPhone_UserGuide.pdf
You may want to prevent iPhone from syncing automatically when you connect iPhone to a computer other than the one you usually sync with.
1. Turn off automatic syncing for iPhone: Connect iPhone to your computer. In iTunes, select iPhone in the sidebar, then click the Summary tab. Deselect “Automatically sync when this iPhone is connected.” You can always sync by clicking the Sync button.
2. Prevent automatic syncing for all iPhones and iPods: In iTunes choose iTunes > Preferences (on a Mac) or Edit > Preferences (on a PC), click Devices, and select “Disable automatic syncing for all iPhones and iPods. If this checkbox is selected, iPhone won’t sync automatically, even if “Automatically sync when this iPhone is connected” is selected in the Summary pane.
3. Prevent automatic syncing one time, without changing settings: Open iTunes. Then, as you connect iPhone to your computer, press and hold Command-Option (on a Mac) or Shift-Control (on a PC) until you see iPhone appear in the sidebar."
I use option 3 without any problems.

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