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I believe Buck has the original eMac which is a bit harder to get to the innards. I considered putting in a different hard drive in my Dad's but backed off when I saw what was involved. Using externals seemed a better option.
Ah - missed that. There are two sorts of 800MHz models - one with the ATI graphics, one without. In the specs he listed, you can tell by the system bus; the later one had a 133MHz system bus.
So, yeah - Kris is right, the external is definitely an easier option. Of course, if you're adventurous, you can always go for the internal, but it's the sort of thing I'd be more likely to recommend only if you're very comfortable taking things apart, and don't tend to be one of those people who have an interesting little pile of "leftovers" when you're done!
I've taken apart the original iMacs to replace hard drives and optical drives - they're not much fun to work on, but if you follow the directions carefully, keep all the screws in separate little bowls etc., it's certainly not impossible. Of course I had nothing to lose when I did it - they were "rescue" machines from the recycling depot.
