Looking to replace my recently deceased PM tower. Rather long in the tooth, the motherboard finally took a poo. Apple has a few refurbs, and I am stuck trying to decide between these 2: The 2.8GHz is $100 cheaper, and has a slightly larger drive and 1G more RAM (2x1G). It also has the ATI 2600 XT. However, I am thinking the better processor of the 3GHz trumps the overpriced RAM and HD in the former. The pre-installed RAM is not much of a concern, as either way I would be upping it with additional (and much cheaper) 3rd party chips. Most all of my "important" client files are currently residing on an external drive, so the internal is not a huge factor. Both setups are easily expandable. So, is the 3GHz a better choice for $100 more?