So, after reading all the responses, it looks like Wii is the way to go. My son gets excercise, it's more sociable, and everyone seems to have fun. I also noticed that there are less PS3 fans, and once you factor in that the PS2 games won't work on the new PS3 consoles, I may as well keep the PS2 and get the Wii.
Thanks everyone! I appreciate the feedback and have reached a decision! Shall let you know what hubby thinks after Christmas