I'm looking to upgrade from the C2D e6850 for as cheap as I can. I'm staying on the LGA 775 socket. I have found a used QX6800 for 150 and was wondering if I should get it, or play a little more for a new q8300, q8400, q9300, q9400. The QX6800 is even older than my current processor, but it performs really well. However, the newer quads run on less power and have newer architecture. What would you guys do?