Good discussion!
I've been PC-biased for about 10 years (since about the megadrive time). I bought a PS2 about 12 months ago, because I wanted to play a couple of games in particular, and I also wanted a DVD player...
I just bought a cube, 'cos I wanted to play Zelda.
There's a pattern here folks... buy something that does what you want it to do!!!!! It's simple. You want a cheapo dvd/console, buy a ps2. You want a xbox, buy a PC

, you want a brilliantly designed machine to brilliantly designed games, buy a Gamecube.
As far as gaming goes, each brand has it's own particular titles, you make the choice, and buy the console.
As for design, out of the 4 platforms, there is simply no competition. My PC is about 2'x2'x1' & weighs a tonne. My PS2 has got the quite possibly the worst bit of aesthetic product design in history. The gamcube is fantastic. It's small. It's to the point. (an no, i didn't miss the xbox out of the design bit by accident

).
All Nintendo have to do is follow Nokia's lead, and release a cube with a set of clip on covers, then anyone can make their console look however they want. If they included a power socket, you could have all kinds of neon boxes popping up

Another point here, is the quality of the components inside the box. My PC has top notch components, 'cos i could choose them. The PS2, well, I wouldn't agree that it's dvd playback sucks (i think it's perfectly acceptable), but it's image quality in games is incredibly bad. I bought a quality scart lead, and the gamecube on a composite lead still kicks the crap out of the ps2. The picture and sound quality of the gamecube blows me away.
Anyway, i've said enough