I've decided I want to get a 24" iMac. I plan on using it with the eyetv hybrid as a combo awesome computer and hdtv. Here's my question: should i Go for the NEW 2.8ghz at $1699 (w/ student discount) or the Refurbed 2.8ghz extreme for $1599?? Looks like they both have the same graphics card, the refurb comes with a 500GB harddrive vs. the new one at 320GB. Is the processor different? I know the new ones are penryn based, but is the 2.8 extreme in the refurb faster?