Don't get me wrong. I love macs. If you have the budget and want a new machine that is what I would recommend (more due to Vista than anything else). The belief that they are somehow "special" when it comes to creative applications is just out-dated. Mac's do not have "magic files" that automatically produce better art. These days it is all about the software. If you are comparing Windows Movie Maker to iMovie. Yes Mac is much better. If you are planning on running 3rd party software (Adobe products, Quark, InDesign, Vegas) Then a file is a file.
If you would like to do video editing and have a 2700 budget. My advice is spend it on software. A good PC loaded with Premiere Pro, Vegas, and Ulead and Audition will accomplish more than an out of the box Mac with iMovie.
Also, if you working with a web site. 95% of your visitors are going to view it with a PC.