Forget about the Samsung 203 series. Those are discontinued, hard to find new, and they're not the fastest readers anymore. Get a Samsung SH-S243N instead. Those are new, easy to find, they burn well, and will rip and read faster than anything with patched firmware.
However, if you want the best media quality testing capability as well, then you need to get a Lite-On, but the problem is, most Lite-Ons these days are rebadged Sony/NEC/Optiarc drives, so that's obviously not what you want. Try to find a Lite-On that has a model designation which includes "-08". Those are the ones that can scan. Other models with -04, -32, -98, etc., may not be able to scan.
Note that, while the Samsung drives can do quality testing of media, they can't scan for jitter, so they are more limited than Lite-On drives. Also, Lite-On drives can do accurate scanning at 8x speed, whereas Samsung drives are generally limited to 4x.