I think it has a 4 year warranty. The ACD is $1799, The NEC is about $100 more and for that $100 you get many many improvements. You would spend more than that on extendingt the 1 year ACD waranty to 3 years. Read the review at "Trusted Reviews" It's kind of ugly but I'm more interested in performance.
Unfortunately only three years for the Oz model http://www.nec.com.au/37ef8a6386c24d0bacb63f0ab8cb0298.htm
Even if Apple come out with a new 30", it probably won't better this deal, unless they cut their prices by at least 25%.