Okay, I thought I had my mind made up on the 2.8 refurb...and then today this Core 2 Extreme popped up in the Refurb Store... Same specs, except for the "Extreme" card and a 500gb hard drive, vs. the 320gb hard drive. The regular Core 2 Duo is $1199; the Extreme is $1299. What do you think? Can you tell me what the difference in the processors is? Thanks!