If anyone's interested, I just used the Data Transfer Utility in v3.15 to transfer my 80GB BC PS3 to the PS3 slim. It "copies" everything, and then "moves" the protected saves. You don't get a choice in what gets moved or not, unless you delete it from your original PS3 before running the utility.
Everything worked great! It even copies the accounts over for you, though it does not copy over their passwords. Make sure to deactivate your accounts on the old PS3 before running the utility, then activate them on the new PS3 afterwards. (It will prompt you to do this if you forget, though it doesn't wipe the old PS3)