What kind of PC would I need to play The Sims 3, Spore, Black & White 2 games?

I like Dell PCs, I've checked into Alienware.. I need good specifics. I'm thinking about purchasing possible gaming PC in a matter of months.What kind of PC would I need to play The Sims 3, Spore, Black %26amp; White 2 games?
Well The Sims 3 works for Windows XP %26amp; Windows Vista OR If you have a Mac it works too =]



Thanks so much for Reading

Jazmin aka JazzyWhat kind of PC would I need to play The Sims 3, Spore, Black %26amp; White 2 games?
Those are pretty undemanding games. Most any current PC will do.