I'm buying my daughter an ATV3 for Xmas and am worried about her computer to support it. She currently has an old Windows PC running over wireless G. Will that be a problem? Should I put a N network card in? Wired isn't an option. Would I be better off getting her an old laptop and plugging it in to her router to use just for iTunes? What would be the min specs that would be trouble free for her. Thanks for the advice.