Sounds extremely specific, but in a way I can't see why such a product
wouldn't be the standard - external drives are about flexibility (so
USB+1394), SATA is the new format, and what's the point of having that
power brick externally?!
I found some units, in prices ranging from $60 to $100 - compared to
$20-50 for units with less features - and that's even without a
built-in AC adapter, and most looke shady anyway. Maybe you know
better?

One thing I don't care about is an external SATA interface.