...and to make matters worse they have been listening to a quack job computer repairman who despises apple because he is not licensed to work on them...
Oh well. Computer repairmen really know their stuff, so he must be right. On the other hand, I work with dozens and dozens of software developers. Young ones, old and bearded ones. All kinds. Ten years ago the opinions between software developers were divided: Half of them believed that Windows is crap compared to Unix, half of them believed that Windows is crap compared to a Mac. Today, they all agree that Windows is crap compared to MacOS X. Software developers buy Macs. And they are the people who know something about computers, not that screwdriver wielding computer repairman.
Here's what you get: A state of the art Unix system. One hundred percent certified Posix compatible (translated to the layman: It works), not like Windows which is a proprietary system (translated to the layman: You are stuffed) that is incompatible with real computers. You get the most internet compatible browser in the world (Safari) instead of Internet Exploder which is against all standards. MacOS X doesn't get infected by viruses so they don't have to pay that nice computer repairman lots of money all the time to fix your computer. A huge set of applications for photos, DVDs, media and so on. Remember that Apple is the absolute leader in the graphics market. The complete software development system. You get, for free, exactly the same software tools that Apple is using itself to create MacOS X and all their applications. About hundred top quality fonts for free. Not the cheap ones where you get five hundred fonts on a CD with half the letters missing, but complete fonts that cover everything. If you study languages, that is an absolute winner.
And if you want to upgrade your MacBook: Ok, you need tools. To be exact, a screwdriver. With these tools, you can, without the help of the computer repairman who knows everything better, upgrade the memory on your computer and the hard drive. Monitor too small? Buy an external monitor. 24 inch monitor, that lets you work twice as efficiently. Automatic backup. Did you know that only four percent of Windows users ever backup their computers? If anything goes wrong, they are stuffed. You're not.
Good luck convincing your parents. Just tell them what my wife says: Buying a Windows computer would be a reason for divorce. She knows nothing about computers except (a) a Macintosh works and (b) to turn off a Windows computer, you go to the "Start" menu.