OK Im looking at making a External Hard Drive bank with 2 more HDDs.

At todays standards, what is the better middle of the line HDD for storing/working with music stuff on and NOT the high dollar or junk models LOL. 

Thanks in advance-

I have an External Esata or SATA connection available for use

You can get a 3TB Western Digital MyBook external for about $140, 4TB from $300 upwards.