Yes, PCs are cheaper and most of the world uses Windows. Personally, I have nothing against PCs per se, and have had some quite good ones (Olivetti, Toshiba Satellite Pro and Sony Vaio).
I'm one of those who came to Mac as a result of owning an iPod. I loved the form factor, the style, and the ease of use of iTunes (especially when compared to the torture of using the extremely complicated system of burning CDs on Windows). Above all, I was very impressed by Apple's customer care; two of my early iPods expired while still under warranty - some of the classics had battery "issues" - and Apple replaced them without a problem. There was another reason, besides form factor, style, well built machine, good customer service, etc why I finally decided to switch and it was this: On an Apple system there is very little spam, malware etc (which I found an absolute nightmare on Windows, despite having purchased - not downloaded - the most robust anti-virus software I could find), and there are no viruses. To my way of thinking, this really does make a difference to the actual physical experience of using a computer daily.
So, for your money, with a Mac, you get a better machine (OS is better than Windows), more aesthetically pleasing computer, excellent screen, faster response times, integrated system where it "just works", uncomplicated systems, good customer care, no viruses. I'd imagine that you will three to four years easily from a Mac; Applecare (which I always get) gives three years cover, which extends the one year warranty by two further years.
Of course, the downside is you do pay more than you would for a Windows machine; however, you are buying a better machine. Myself, I see it in terms of an investment. I work at my desk and I prefer my work tools to be the best I can offer myself, and I much prefer Mac to the Windows world (and since I switched, I have worked in environments where Windows was the norm, and so found myself using both OS and Windows). Office for Mac solves the question of working with Word (which my entire work world uses), and Bootcamp allows those who need to use Windows on a Mac to do so.
Good luck
Cheers