my advice is to head over to steam
or live marketplace
, and stock pile some demos. If it runs at a playable level, and is something you like, then grab it. That will be your best bet, in not wasting money on a game that wont be playable. (i got the shaft on Team Fortress 2... live and learn
* there are hundreds of gaming sites that offer demos/trials. so there's a wide variety of games to check out.