I completely agree with Cyber. I have a MacBook Pro after being a lifetime PC user. The main reason I switched to a Mac was because at the time Vista was not running well at all and for the price of me getting XP, I could get a Mac for a slightly lower price. I purchased a computer that was a demo for 1 day and was being replaced by a newer model. The price was discounted by $500 and I also got a 3 year warranty with accidental damage.
The first thing you need to ask yourself is what you are using it for. Either type will do what you listed pretty easily. Apple does not support multi-media as well as XP or Vista and strangely has poor sound quality. Since MacBooks do not have firewire and is not available in 15". When taking away the firewire port, Apple did not all provide a universal memory card reader and reduced the number of ports including USBs. Because Apple does not support multi-media and has weak sound chips all you get, is average or minimal stereo
Also Apple makes their computers so upgrading to a better disc drive or upgrading to stronger technologies impossible. Apple's software and OS are quicker and simpler to use and far more reliable, but at the same time when Apple gets a serious bug in its OS, its next to impossible to fix and can truly cause problems.
For instance, I have OSX and the my video and sound do not take advantage of the more expensive hardware features that Apple provided two years ago. That is the major reason why gaming and 3D video suck on Macs and something to consider.
If you own Macs, history appears to show you will own your computer for a longer period of time. But it appears Mac quality is not as good in the years past particularly the mother board.
IE7 is definitely stronger than Safari. And although Macs are 64 bit, the Max RAM you can add is only 4GB.
I have XP on my Mac using bootcamp and the thing I like most is that enables me to use my old and other software. Don't get me wrong, I really like my mac and it suits my needs. I enjoy the integration of the software and OS. But if the next version of windows or Vista improves to make it better than XP, can support more ports Firewire SD memory an allow Matte screens, I maybe going back to PCs if the hardware reliability also improves.
For your uses, a PC will be more than enough for what you will need for a long time. But if you like things like graphics film and photo editing, Macs are great for mixing and matching-simpler.
Software is no longer a problem on Macs. In fact the freeware is much more sophisticated. If you like fin tuning your machine or tweaking around. You will not like the Macs. If you just want to turn it on and run it, Macs are certainly simpler to run.