Oh, and Number Munchers. That game is messed up, man.
Man...that takes me way back! My very first memory with computers is playing number munchers on a mac when I was 9. They'd let us play at school when we performed well in class 10 times. xD I kicked ass at prime numbers, but the monsters in later levels sorta scared me :3
Back on topic - I'll go with what the other posters said, the Mac is definitely to be favoured for the above posted reasons. Me personally I'm a bit of a blackbook fangirl (I love the back of my blackbook.. the white apple against the pitch black matte plastic looks hot!)
Do not get HP. I don't care how kickass the specs sound, I think the Pavilion tx1000 vista tablet edition I had before traumatized me. If I ever get a non-mac computer again I'll get a high end Vaio desktop replacement. Not sure if it'll perform better, but at least it's gotta be the sweetest looking machine I've seen in a long time. =) (Next to the blackbook and the macbook air)