The Wii is solid. Nintendo always keeps in mind that their consumers consist primarily of, but not restricted to, adolescents who are going to be very rough with the hardware either deliberately or through the occasional accident.
I've owned every Nintendo product since the NES with the exception of the Virtual Boy and Gameboy Micro. They are all SUPER durable and have withstood my own occasional bone-headed accidents.
I've had the Wii since launch and have had 0 problems in any capacity, so I say go for it!