Just as I was about to order my sub-£500 quad-core 4GB system, someone suggested that I seriously consider the Intel Core 2 Duo E6850 CPU instead of the Q6600. Not only is it cheaper, but at stock settings it is supposed to be faster (3GHz clock vs 2.4GHz clock of the Q6600). For a PC that's simply going to be used for Vista-64 doing Web surfing, emails, a bit of photo editting and some CAD software, which one would you go for (assuming the system will have 4GB of RAM)? I would need the system to last at least five years.