I will relate my own experience -
I used PCs daily for over 15 years, for work and making computer music.
Bought a macbook after trying a friend's out, plus I got a $good deal abroad
A month later I moved all my work/apps over to said macbook from my pc.
6 months later I bought a macbook pro to do my music on.
My PC now sits in the corner for downloading or if I want to watch TV when I work.
I will never buy another PC.
Now the haters can flame on and that's fine, I'm not saying PCs are any worse or better than macs - like I said I'm just writing down my experience.
I never get into these gay arguments over which is better... they just make me tired.
Find a platform/OS you like and if it works for you, stick with it.
oh and edit : I'd get a macbook pro, and max out the ram (just don't buy it from Apple)