Best drive for mass DVD Ripping?

Hi,

I have set up a rig specifically for ripping DVD’s.

I will be using 5 drives and ripping sequentially.

My questions is which drive should I buy (x5), bear in mind that I have to rip +1000 dvds.

Options are: (price in ascending order from £12-19 or $19-$30)

Samsung SH-S223C
LiteOn IHAS124-19
Sony AD-5260S-0B
Sony AD-7260S
Sony DRU-870s
Sony DRU-880s
LiteOn IHAS324-32

Speed is pretty paramount. I have had success with an external Samsung with modified firmware using the Patch Utility.

Please help.

Thanks

Gaz