|I agree with #3 above as the easiest solution and you will have the bonus of extra storage available. |
Most docking stations are dedicated to either PATA or SATA. there are powered cable connectors that will work on ANY type of drive. See the link below.
BTW, if you are going to toss the old towers you should remove the hard drives for security reasons anyway.
I have this model and it works great on all hard drives and optical drives too.