This is kind of old. I remember someone posting about the rumored "Lexus" line of laptops and desktops back in June.
Take it from someone who within six months has owned the Inspiron 5160, several Inspiron 9300s and an XPS-2, technology is never going to stop advancing. You should just buy the product that is going to make you happy in your pursuits or interests, i.e. gaming, movies, business apps, burning, etc.
I'm sure people who opted to buy SLI'd Ultras earlier in the year, can't be happy with the GTX 7800 outperforming two Ultras and being half the price, but it happens.