Ok, so originally I was considering upgrading my 2006 MP from dual 2.66 chips with dual cores to the x5355 quad core chips. Had a good deal from a friend who was willing to sell them to me for $600. for the pair. Doing some cost analysis, I figured the best bang for the buck for me with extendability into the future really would be finding a 2008 octo 2.8Ghz MP and then selling my 2006. Well, last evening, on my local Craigslist, I came across a 2008 octo 2.8 with 8GB of memory and 2 TB of disk for the sum of $1750. Picked it up this evening and the damn machine is in perfect condition. Put my 2006 MP on Craigslist (asking $1500) and I already have a few who want to look at it. Best $250. I ever spent!