Thank you for the reply. At this point, I'm still pretty undecided.
Also, after looking into a project done by a forum member of the game I'll be using the iMac to play, I'm leaning even more towards the 2.8ghz model.
According to his experiment, RAM has little or no effect on framerates:
While CPU speeds have a much larger effect:
I'll probably be spending a decent amount of time playing the game, so those stats put the 2.8 model at a slight advantage.
Also, the 2.8ghz model compares better in terms of price. When I get the iMac, I want to have iLife '09, iWork '09, and a 1 TB hard drive. The price of the 2.8 model ($1199), iLife '09 ($61.99), iWork '09 ($38.98), and a 1TB Firewire 400 hard drive ($90) is $1,389.97. The price of the 2.66ghz model ($1299), iWork '09 ($38.98), 1TB USB 2.0 hard drive ($90) is $1,427.98. Add the Apple Remote (the 2.8 comes with it), and its $1,445.97, $56 more expensive than the 2.8. As the iMac purchase itself is already stretching my budget, advantage 2.8ghz.
However, the 2.66ghz iMac has 4GB of DDR3 RAM, instead of the 2.8ghz's 2GB of DDR2. This gives the 2.66 a slight advantage IMO, because DDR3 memory often has high timing, making it about the same as or slower than DDR2.
The 2.8ghz iMac has 320gb of hard drive space, while the 2.66 has 640gb. For me, this doesn't mean much, as my collection of data is somewhat small at only 100gb. So while the 2.66 gets a slight advantage, it's not much, as I'll never fill the 320gb one anyway.
The 2.66ghz iMac also has an additional USB 2.0 port, but it lacks a FireWire 400 port. The external hard drive I am purchasing connects with both USB 2.0 and Firewire 400, so this is a draw.
So, if you have any suggestions or information that could help me make a decision in either direction, that would be greatly appreciated, although keep in mind that I am leaning towards the older iMac. They both come with 1 year warranties, anyway.
Thanks in advance for your replies