OK, if you want to play games then it def has to be a PC, but if that's one of its functions then I'd go for the best graphics card - latest games will knock the hell out of it.....
I summarise airport express
here. You can think of Apple TV as a video iPod that you plug into your telly with a gorgeous interface for browsing music and movies, but can also stream video or audio from the internet and your computer.
And whilst alienware and xps are def gaming machines, don't rule out normal laptops like those mentioned above, just spec the graphics card or processor or memory higher - alienware are stupidly expensive and you could find an almost identically spec'd "less cool" machine for much less.
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