My favorite ones are:
PS3
Xbox 360
Nintendo DSi
Nintendo Wii
I have a small collection of games, consoles and portables alike...
Actual List:
Nintendo DSi
Sega Master System Revolution (Tectoy Brasil - It's kind of a bummer you cant put cartridges :( )
Nintendo Wii
Xbox 360 E (Need to repair some stuff)
Playstation 3 Slim (Sadly broken)
Playstation 2 Slim (didnt play too much, it's broken)
SUP2 (Didnt play too much )