All I can say is that even though Apple went through some rough times a few years back, they have more than pulled through. I got one of the last Titanium Powerbooks, and basically it sucks on the outside, but it runs like a dream. The newer aluminium cases are much better, even though they look a little cheap in my opinion. I'm, like a few others around here, a die-hard Mac fan, and I wouldn't dream of using Windows for personal use, ever.
I think one of the BEST features of the Mac is the hot-swappable USB and FireWire ports. You don't have to worry about the computer flipping on you just because it thinks a connection was lost accidentally when you meant to unplug it.
The graphics are amazing, which explains why Disney and Pixar use Macs to do their animation. Tbone is right that hackers don't care so much about Macs as there are MANY more network infrastructures that can be destroyed with Windows viruses versus Mac viruses. I would still invest in some sort of Anti Virus and Disk Care software, as you can't go wrong with too much protection, especially if you do a lot of file transferring or downloading.
Good luck on the search for a new machine, I know you'll be happy with a Mac.