Not sure about the riplock thing, although the drive I mentioned (Philips 1660 crossflashed to DW1650) certainly rips fast enough for me.
I'm not sure about modded/RPC1 firmware for the BenQ...you'd have to have a look around the BenQ forum.
If the Philips is cheaper than the equivalent BenQ (DW1650), then I'd buy that and crossflash it (heed the warranty warning above). But if the BenQ costs the same, or is cheaper, get the BenQ (no crossflashing required, and your warranty stays intact).
Also, you can quality scan on the BenQ (not sure if scanning is possible on the Philips drive without crossflashing, as I flashed mine to a BenQ as soon as I hooked it up) and LiteOn drive you mentioned.