1. what does a good video card tend to cost?
Depends on what you're looking for. Most people are happy with a card that costs about $150. There is a big variety, though. You can get video cards for $50-$800, but expect to pay $150 for a current video card that should run new games for a few years that is still affordable.
2. what exists for game controllers?
I love my Logitech Rumblepad 2. It's a PS2 controller clone, essentially. Most PC controllers are based off the PS2 controller, and sometimes the 360 controller. Note that most PC games with "Games for Windows Live" on them are more likely to support your 360 controller.
3. does steam have points cards or anything you can buy or is it necessary to give valve your CC info?
No on the point cards, unfortunately. They do accept Paypal, though. Another option is to buy one of those Visa gift cards (or Mastercard, whatever) and use that.
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Zachnorn
Everything = overrated.