Generally, the higher price points are due to more features such as higher reading/writing speeds, extra capability such as BD writing, retail packages which may include extras such as cabling and software. If your goal is simply to read the disc while watching, the lowest cost option should suffice.
If you are ripping discs, you may want to pay some heed to the read speeds (e.g. 12x will read faster than 10x). Also, some drives may be noisier than others.
