Restart the CD iMac in Target Disk Mode and connect to the C2D iMac.
Then fire up Migration Assistant.
A few notes. When you first setup your new iMac make the first user named something other than your user on the CD iMac. This will prevent problems with Migration Assistant.
And I don't know if it was just me but when I used MA QuickTime Pro 'forgot' its' serial number so make sure you have that handy, but again, YMMV.