I would say Xbox also, its just so much more powerful and has much easier to use storage (HDD) and networking that allows my favourite homebrew app of all time to exist: XBMC.
That app is truly something to hold up as an example as to what can be done with a homebrew project.
Xbox doesn't require a modchip either if you can be bothered taking the HDD out and doing a few things to it via a linux bootable cd on a PC.
I know most of the good things for it are made with the official SDK and that makes them illegal to distribute, but I don't really feel there's anything 'morally' wrong with homebrew built with it. Its not hurting M$ at all.
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