<< i thought i read somehwere that the 16x don't necessarily write at 16x (from start to finish), or that they only reach 16x for packet writing...or something....an example is the 16x yamaha drive..not sure if this applies to the plextor/tdk models. >>
This only applied to the Yamaha drive. They wanted to get it out faster and at the time, had that technology available to them at a reasonable price. The difference between partial 16x and full 16x is next to nothing, less than a few seconds. The Yamaha more or less is a 16x drive.
<< 12x = 5 mins 40 secs for a disc >>
Actually it's more like 7 minutes. 12x write is 1800k/s, effectively taking 6 minutes 15 seconds to write the data, and then you have some additional time left over to write the table of contents. After this you're close to 7 minutes. Keep in mind this is for 650mb discs.
With a 16x drive your write speed is 2400k/s effectively taking 4 minutes 35 seconds to write data, and a bit more time to write your TOC. The difference is more than 40 seconds, it's closer to 2 minutes. Either way, small sacrifice in speed.
<< On second thought there's extra regular CD read, upto 40x... >>
True, but the only time your drive takes advantage of this is when you run something off of CD (which is rare) and when you install something. 8x isn't that large of a speed difference on installs.
<< I went from a 4x to 16x burner. Go for the 16x. It has a faster DAE speed. >>
Actually the 16x plextors have 32x DAE, the same as the 12x drive with firmware updates.
dm