The BenQ DW-1620 has excellent CD and DVD writing capabilities. The recording with -R media is getting better but +R media is amazing, it's the best burner for the +R format. In addition this drive has some of the best cd ripping capabilities as far as error correction goes. It's a bit on the slower side for reading DVD's and discs in general, but it is by no means sluggish.
The Plextor 716A seems to be the fastest reader but the writing quality is not up to the level of the BenQ. Also, if you plan on copying games the BenQ isn't the greatest for that, but it can read all protected audio discs.