You can get both installed by Apple, that's an option with the top 21.5" and the 2 27" iMacs.
If you aren't sure, you can check if you have any PowerPC apps on your mac by going into System Profiler and choosing Applications on the left. These are what I have left that are running PowerPC (Rosetta)
Wow... Lion is going to be a problem for me. I have 64 apps that are PPC only. A lot just need weeding out or updating... but not all we be "transferable". So maybe I shouldn't use Lion as a reason to wait....
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