Here is my 2 cents....
What are your needs...cd backups, audio burns, data burns etc....that may affect your decsion...I would go the Liteon on path...excellent overall burners , fast...they upgrade firmware frequently
Excellent for reproducing protections....
I have used plex, HP, ricoh and liteon...I see no difference in the audio from any of the brands
I would get the 40x cdrw Cendyne burner from Officemax for $55 after rebate...the other nice feature is ..you can upgrade to 48x cdrw with P-CAV burning by flashing the firmware...or wait 2-3 mo and get the 48/24/48 cdrw from Liteon
I would sell both the cendyne 32x cdrw, and Yahama and buy the 40x burner...you will see a nice speed improvement on the 40 xwith P-CAV(again a firmware update) or O/C to 48x...they hardware chipset in the Liteon 40x and 48x are the same ....
BTW..the liteon will support Mt Rainier as well(at least the 40/48x do..the 32x does not)