all depends on the type of games you like and weather you want to use it as a media device also. I had a Wii and own a PS3 and Xbox.
PS3 with Move good for family games but also has hardcore shooters which use the technology. For kids Littlebig planet has kept my 6 year happy for 2 years now. Also the bluray player, iPlayer and Lovefilm streaming is all great plus no network fees.
Xbox very good and I’m also think about getting Kinect but if I had to choose one console it would probably be PS3