I'm making a total switch from Windows PCs/laptops to Mac. I'll be purchasing either the Mac Book or Mac Book Pro soon and waiting to see what they do with the iMacs before purchasing one of those. So what other items will I need - Time Capsule? Airport Base? Keep my old wireless router? Anything else I might need to get? Also, would it be better to go with a faster CPU or faster hard drive as I don't think I can afford the higher priced ones? Thanks.