For sheer cost, a Mac is not worth it unless you need the additional software.
I'm not certain if Macs are more expensive in the long run. Even though most of Mac's software seems significantly less expensive, it's easier to download pirated Windows software for free (assuming there aren't any viruses or malware attached to the download). Cracks, serials, keygens, retail copies, it's all out there. I'm sure that's why Windows is offering a deep student discount on their new OS; the company is well aware that college kids make up the highest population of P2P downloaders. Plus, there are more legitimate, freeware programs for a PC. Many more.
Additionally, if your Windows OS screws up (and it will) it usually doesn't require you to pay for professional help. Most people in the U.S. use PCs and most people are also used to the problems that go along w/ the OS, so it's pretty easy to find a help article or a freeware program that will solve the problem, and if not, I'm sure you can find a buddy or a relative who knows how to fix the issue. There are more techs for that OS than the others.
Mac "experts", on the other hand, are few and far bwtn. Better head to your nearest Genuis Bar if you need assistance. Depending on your warranty status, that could potentially cost a lot of money. Nevertheless, it's money well spent b/c those folks seem to know their stuff and don't mind answering any questions. I've tried other professional companies that were marketed towards PCs, and none stack up the Genuis Bar.
So, at face value, it might appear that PCs are the better deal. However, that impression might significantly fade after you factor in warranty issues. Typically, Windows warrants the OS, a different company warrants the machine itself, (like Dell, Toshiba, etc.) and another company warrants their own software that you've installed. Assume your warranty coves the issues you're having w/ your laptop, so you head to the store you purchased it from so it can be fixed. Just watch how quickly they'll claim that the OS is causing the problem and they aren't responsible for it. Thus, the warranty won't work there. Contact Microsoft and they'll blame the issue on the hardware which they aren't responsible for. Toshiba blames Microsoft, Microsoft blames Toshiba. On and on it goes until you finally break down and visit the Geek Squad for big bucks.
The run around doesn't happen w/ a Mac since the physical machine is theirs and the OS is theirs.