Right NOW?
1. Lite-on 24X (cheap, fast, will back up nearly anything, low coaster rate, POSSIBLY (will get good arguments on both sides) better drive than the Plex, for half the price. Did I mention cheap? - as in $90 shipped in a retail box with latest version of Nero).
2. Plextor 24X - (great drive, fast, low coaster rate, will back up nearly anything, you get an IDE cable included for your extra $70-$90, expensive).
3. Close call. Several nice drives I would buy third, including several rebadged Lite-ons (Cendyne comes to mind), and the new TDK 24X.
Between the Lite-on and the Plexy, it would be a hard decision to choose between them (if I couldn't sell it) if someone was going to give me one. I might take the Plex simply because of their long standing and well earned reputation for reliability and the better CD-RW reading performance (and I can always use an extra IDE cable). Would I even THINK about paying almost double for the Plextor? No.
In 180 days? (a guess)
1. Lite-on 32X (supposed to be released sometime in December, available in quantities in January, will probably be RELEASED at well BELOW $150).
2. Plextor 32X (if available).
3. Your guess is as good as mine.
Nack