Advise lang mga Bro based on experience.
Sa dami nyong nakapila, the fastest way to prepare your drives is to copy them straight (500GB or 1000GB). Walang pili-pilian muna. I was actually surprised to read that Gren can finish 1TB in about 4 hours. It's possible with sustained copy speed of about 66MB/sec via eSATA, but then full format palang ng 1TB HD, 4 hours na halos.
Tapos if you want any other particular titles or if you want to delete any title you dont need, then I think you have to do it individually, on your own time, by visiting the shop again once you get your NMT.