Do you have a guitar now that works well? If so, then Wii. If not, then get the Wii idea and get it out of your head. You can get one at any time. THe guitar on the other hand, you can start practicing right away and it will better you as a person. The Wii will only distract you. And as a musician myself, I can vouch for that. Video games can easily distract you from practicing or producing in my instance. Regardless, we still need to have fun, just do it in moderation.