First things first, read the jungleflasher.pdf file, it is VERY IMPORTANT, anyways if you have to have a via 6421(usb models available) or equivalent its a good start, and you'll need a powersupply made for x360 dvd-rom. Do Not use the x360 to power the drive.
That Said, for your lite-on 360 you'll need an extra(possibly two chips) chip to read the dvdkey. MRA hack(for updated 360's) & ck3-pro(connectivity kit 3) chip & Jungleflasher
For the BenQ all you need is the powersupply and Jungleflasher
As For powering the drive the ck3-pro does that too, or you can get a standalone powersupply, you cant use your pc itself