What do I do?

I'm in a bit of a quandary right now. It's the old PC v. Mac thing. My Dell Latitude D600 is fading fast. I've broken one of the hinges and it's getting a bit rusty. I've never owned anything but a Dell. I've owned a Dell P-133 desktop, an Inspiron 3500, and now my Latitude D600. Now don't get me wrong. I have worked on Macs before. When I was in the corporate world my first word processor was an Mac Plus - we often referred to them as Mac in the Box because the monitor floppy drive and hard drive was all self-contained in this little box. But because they were so expensive to fix our company went to a PC network and I've never looked back. Besides, PCs were easy to upgrade and there was a lot more software available for PCs. Now. . .with the advent and implementation of the dual-core processor by Apple I've reconsidered purchasing a Mac. I would love to purchase a Mac-Book Pro with the hopes of being able to run both Mac-based and Windows-...