I currently have the old 24" iMac with 2.16 GHz, nVidea 7600 256MB card. How does this compare to say the new 24" iMac with a 2.4 GHz chip and ATI video card? (besides the obvious external differences) Will I see a big difference in performance?
I would just continue using your current iMAc. I dont like the new ones and prefer the old ones. It turns out that their value lasts longer.
I would suggest you to put it up on ebay or somehow sell it for the same price as a new iMac. I think that in some time people will be fighting for the old iMac specifically yours because of its graphic card and maybe design.
Maybe I will see what I can get on eBay. I honestly really like the new design, but not enough to take a loss in performance. Macworld claims an overall increase of 9% with the new 2.4's, but a loss in a few frames with unreal. Now the question is how much of a difference will there be with the 2.8 extremes over the 2.4.