I figure I might as well chip in now that this got bumped.

1. GameCube (Purple) - Maybe it's nostalgia but this thing is a beauty in my eyes.
2. GameBoy Advanced SP (Any) - Great minimalistic design and so smooth and shiny.
3. Nintendo 3DS (Anything other than 2DS) - Many different versions that look good in different ways. I have the Aqua Blue one which is very nice.
4. Nintendo Switch (Neon Joy Cons) - Slick design and I like the colors of the Joy Cons a lot too.
5. Xbox (OG) - Never owned it, but the design has enough personality to make me kinda wish I did.

Honorable mentions: PS1, PS4, Vita, Wii

Actually I agree the PS5 looks pretty awesome. The PS3 also had a great design. For Xbox consoles I like the Xbox 360S design and I think the Series S also looks great. For Nintendo the Wii looks best imo.

A few models that come to my mind are below.

Consoles have come a long way from being big grey boxes to slick small machines.

NINTENDO WIIU

XBOX 360 Slim

NINTENDO DS

XBOX SERIES-S