Which graphic card?

I was tinking of buying graphic card for computer as i play games most of time someone can suggest few details about graphic card.

Which will be beter for games.

Need your:

1) Video card slot (PCI, AGP, or PCI-E)

2) Your budget

3) Your power supply wattage. 

i'll tell you but you need to answers these first

1- whats your setup( ram, procecessor, operating system,)

2- what is your powersupply (wattage)

3- what type of games do you want to play

4- budget

5- what slot do you have like do you have a agp slot, pci, or pci express