You cannot select which contacts to sync, but you can limit which groups are visible in the Contacts/Dialer apps:
- In the Contacts app go to
Menu -> Display options.
- Under the "Choose contacts to display" section, tap on the arrow next to your Gmail account to expand it.
- Uncheck all groups except "System Group: My Contacts" and tap the "Done" button.
Now only the selected contacts should be displayed.
Found the official Motorola video on Youtube talking about their Contacts app. At the 1:00 mark they start talking about managing groups. It sounds like you should be able to create a new group and assign your contacts there, and then select to display only that particular group. Give that a shot.