A Benq 1650/55 would be good to get if you can find one. They're excellent burners , good scanners & rippers.
Don't get too carried away with speed as even with quality 16x media many here would burn at 12x or even 8x to get the best quality they can.
You should always run with more than 1 burner anyway as some burn a particular media dye better than others.
Oh and many burners will rip at up to 16x like Liteons & Benqs. But as this is only for the last gig or so the gain in time is not so great. Likewise for burning the time difference between a 16x burn and a 20x burn is a relatively few seconds.