Here's a recommendation for you: get an external USB 3.0 HDD dock. Don't bother with eSATA because it sucks. USB 3.0 will allow you to safely switch out the drives without having to reboot, which is not really possible with eSATA (even though it's supposed to be), while providing enough bandwidth for the drives to run at their full transfer rate (unlike USB 2.0). It's probably one of the most useful gadgets you can get. Very convenient.
"Mind your wants, 'cause someone wants your mind."