I have two Mac's. A 27 inch iMac Quadcore, and a 17 inch Macbook Pro, whilst my girlfriend has a Macbook Air. I also have a badass gaming PC with the latest toys under the hood, and an Acer notebook, so I'm well versed to give an opinion.
In my heart of hearts, stick with a PC. It does anything and everything you want, giving no absolute reason why going for a Mac is a need. Because I dropped a few grand on the Macs, I feel obliged to use them, and do so for my emails, photos and music. Whatever a Mac does, it does incredibly well, makes it look sexy and you enjoy your computing time marvelling at the slickness of it all. However, a PC is more of a workhorse and you can customise the pants of it and make it look just as well as the Mac.
Also, don't let people tell you Macs are immune to crashes and other malfunctions. I had to take my iMac back twice to replace faulty memory, I had issues with Safari crashing, so much to the point that I couldn't use it for 5 minutes without it crashing prompting me to put the Mac back in the box and chuck it in the attic. It only got better with the release of Snow Leopard and now I'm using it again.
Mac is more of an artistic computing experience whilst PC's is there to get things done. Both has their strong points and weak points. Both are equals.