This is exactly the answer I have been looking for in the many threads I've contributed regarding the OP's question. I wish more people here were as helpful as you in your answer because I must say I clearly do not have the knowledge you have for this discussion.Let's figure this out ourself....
You start off saying "Let's figure this out ourself" but what many don't understand is not all of us know the slightest bit in order to figure this out ourselves. Maybe that's where the bad rap comes from regarding unhelpful IT guys. I'm not completely lost here, but have been looking for a clear and concise understanding of what we could expect and why we shouldn't be freaking out. And your response here has done that. In fact, I'm almost tempted to buy the old iMac. Those of us who don't understand these new technologies consider the current iMac like you describe the old PPC. I am very afraid of purchasing an out-of-date computer. But you make it sound like this isn't something we should worry about.
So let me say thanks. And also let this be an example of helpful information in a community dedicated to such yet victim to very unhelpful rhetoric regarding topics requiring an active understanding on new technologies.
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Scared again.....And USB3.
...Anyone who suggests someone should buy the current iMac is making a staggeringly stupid suggestion.