settings.which

Not yet planned to buy an graphic card.Have an 5450 1 gb which isn't good. Well for less than 12k or 10k which is a good card(For crysis 2,witcher 2,gta 4,(&yea gta 5 when it will come out)In medium or high settings).Which card is suitable for these games with a good fps of 25-30+ in med...