I was thinking about this lately, but I always loved the look of the PS2. I I think the black and blue color scheme works really well. And I like the two levels like the top and the bottom part of it.
Second to this, I think the Dreamcast looks really great. The angles on it make the console look so compact. The orange light on the console is placed really well too.
I still think the PS2 had the best looking and at the time most radical design. 1 was cool and iconic. 3 was just ugly. 4 ok, The current design looks cool but is extremely impractical.
Of Nintendo I liked the European SNES, Gameboy Color and DS Lite. N64 is dear to my heart but it was not good looking and the controller was horrendous.