The last Windows PC I had got a virus the very second I got online with it (Ironically, to try and download AVG), and it picked up spyware from absolutely everywhere even though I'm fairly good with computers. I bought a G4 iBook and have never looked back. They're well worth the extra money, just ask anyone who has made the switch! A friend of mine at uni used to build Windows gaming PCs and even he will admit that he prefers his Mac.
The operating system is miles ahead of Windows too, I love how their 'new features' are things that have been appearing in MacOS for the last 5 years.

I'm currently using an Intel 20" iMac and for the space it takes up you won't get a better computer. In my room where I can't even fit a proper bed, it's very useful.
Anyway regarding the topic, I drove into Birmingham city center 2 nights ago and as I approached Broad Street I saw a BNW Lounge infront of me, then as I got onto Broad Street there was another one further ahead! So it ended up being a 3 car convoy for a little while before 2 of us turned off and some cow in an X5 cut me up.