Hi Jftm,
Right now I have 2 of the 1Tb 3.0 Passports running fine at the back of the BDP1. No power-issues. I do somehow get the feeling the one attached to the top-rear-port is slower to transfer files to, but that might be imagination, not sure. In playing there is no problem yet! ( I did encounter serious problems with other drives before).
I'd go with the 3.o versions anyway, because of future compatibility, despite the fact that the BDP1 has use for it. Your PC might, as do other peripherals.
Good luck!
Marius