I was in the same position as you about a month back. I needed a new laptop and wasn't sure whether to wait for Windows 7 or try something new, in this case Snow Leopard. In the end I went for Snow Leopard, and I will never look back on this choice. This is my first ever Mac, and I am really pleased with it, despite thinking I would never own one.
Perhaps the one downside is that they aren't the best machines for gaming. I didn't intend on using my laptop for games, but I decided to give it a go. I have Team Fortress 2 working, but I had to use a piece of software called Crossover to do so.
Anyway, good luck with your decision. My vote goes for Snow Leopard.