I have no idea what kind of drive your Dell has, but do you REALLY need a new writer? Do you really need to save 5-10 seconds off your burning times? While you'll see a big improvement rewriting at 32x vs. 24x, you won't be able to find 32x media for awhile yet. By the time that media is available, faster combo drives will be out and you'll probably be asking us (or emailing me) about them too.
"Blu-ray is just a bag of hurt." - Steve Jobs