I'm not sure I agree with you on that CD-Recorder. My best burn quality on my LiteON 48125W (48x12x48x) usually comes at 12x, which is several steps down from 48x. And the best burn quality from my Plextor Premium usually comes at 8x or 4x, which is MUCH lower then 52x.
Generally I recommend 12x for burning stuff that is important. The problem is that every CD-R type is different. There is still media being manufactured for burning at 2x, and this media doesn't do so well at speed greater then 12x. However some media is now being optomised for speeds of 48x and 52x, and this doesn't always burn as well at speeds below 24x.... if you add the differences between CD burners into the mix, you end up with a complete mess of information!
Which brings me back to 12x, a nice middle ground. If you don't know your media, and/or how it performs under different conditions, then 12x is probably your safest bet.
Punch Cards -> Paper Tape -> Tape Drive -> 8" Floppy Diskette -> 5 1/4" Floppy Diskette -> 3 1/2" "Flippy" Diskette -> CD-R -> DVD±R -> BD-R
The Progression of Computer Media