The TDK drive is just a rebadged Lite On. As for the Plextor, it is a great drive. A little costly, yes, but great. It is picky about the media it will burn to at 52x; however, that really is a good thing: you get great write quality with just about any disc-at the sacrifice of speed in some cases.
I don't have a Lite-On/TDK 52x24x52 drive, but I do have the 52x32x52x one. It does it's best with TY and Ritek discs. Can't speak of any first-hand experince with the Plextor Premium, but I have owned several Plextors and have loved every one of them. I say go for the Plex; remember, it can burn 1GB to a CD-R!
But before dropping $100 on a CD-RW drive, consider: DVD+/-R/RW drives a cheap now too. I just ordered an Optorite 8x DVD burner for $140. It can burn CD's at 40x, plus it has a feature called HD-BURN which can burn 1.4GB of data to a normal CD-R (that's the main reason I got it). NEC's 1300A burners are around $100, but can only burn CD's at 16x. The older 4x Optorite is about $120 (I think), and can burn CD's at 24x. It still has support for HD-BURN, too.
EDIT: Newegg has the 4x Optorite DVD burner for $107.
Soon to be proud user of Mandrake 10 (again!). SuSE 9 sucks!