I've had a Lenovo PC for about 3 years now and I don't think it's going to last much longer. It has significantly slowed down and takes 30 minutes to start up. I've been looking into Macs and I wanted to see if any of you have advice on which model would be best for school? The Pro does have a faster hardware but will the Air do the job just as well? I need it for online class work, care plans, paper work, ebooks and homework assigned through book sites.