I guess what Your dad doesn't like is the price. So here are few "hints" about that :
- MacBook should work fine for many years - while most of PCs - especially those cheap one not necessarily.
- Apple's new versions of OS will work fine even on quite old hardware properly - while almost every Windows needs an upgrade - or it will run like Vista in most cases. ( actually it worked quite nice on my laptop ).
- Mac OS is let's say "immune" to viruses, spyware etc. ( well we know it is not, but 95% of malicious software is for windows ) - so You don't have to buy for Antivirus, Firewall etc. - You can have them, but don't have to.
- Mac OS X updates are free - and new version upgrade is dirt cheap ( 29$ for Snow Leo ).
- If You're a student, You can get 15% discount at Apple Store for selected models.
- And it comes ( Mac ) with full system packed with multimedia software ( iLife etc. ) while Windows does not.
- Most important for me...if You're used to Windows - You are used to errors, bsod, stupid pop- up messages, ballons, windows popping up at logon etc. Once You go Mac - it's like Zen...peace and reliability
No other ideas at the moment.