The Living Centrifuge

So, my computer, as my friends are tired of hearing, is from the Paleozoic era. I bought it in 1999, and it was out of date then. At the time, I had no real designs on starting a theatre company - I just wanted to have a glorified typewriter on which I could check my e-mail from my dial-up connection. The thing is, I still have dial-up (I can hear the chorus of laughter and jeering from here), and I still have this ancient clunker with a partitioned 4GB hard drive. However, my needs have changed drastically. I want high-speed, and the fact is, I don't think my computer even has ethernet capabilities. I need to be able to get information very quickly, and need to be able to use the computer for the business as well as the artistic side of owning a theatre company. I'm not going to be doing a huge amount of designing, but I want to be able to easily view the work of my designers. Anyway, the whole thing boils down to whether or not to get a Mac. Theatre administrators use both PCs and Macs (more use Macs, from what I can tell), and it's true that Mac software is more expensive, but it's more impervious to viruses, and seems like something that you can use for a much longer period of time. That being said, PC's can still go pretty fast, and are comparably easy to use for me, considering I don't need the computer to do any massive graphics stuff. However, there is the video art thing.....editing video art pieces. This is still a burgeoning aspect of my career, but might be something I'd need to do......Argh! Help! Do I get a Mac or a PC?