I think that the Apple screen is crisper, though the Dell is no slouch. Drive down to an Apple store and look at the screen.
I work with Dell, Planar, and Aquos screens at work. From what a tech said to me, Dell badges Planar and Aquos screens.
It the cost savings is a lot, save the money and take your wife out for a fine night of fun, or take a random mini trip. You might get more mileage out of that, than you would an aluminum screen.
This said, I might opt for the screen than taking my honey up the coast for a day. She loves me, and I would more likely skip driveing to work for a few months to save the cash for a trip... Humm- perhaps I should start takeing the bus again.