The 470, if its fits your budget, obviously.
But, to be honest, i wuld definitely pony up and grab an RX 480. That will have close to GTX 980 performance and will cost $200 for the 4gig version and $229 for teh 8gig one. And i would get the 8 gig one just to be sure i won;t need anotehr GPU for some years to come. You just can;t beat the price/performance ration on that card.
Regardless, even teh 460 would be alot better than what you wanted and should be between 100 and 150. There is no info about teh prices of teh 460 and 470, but that info should be out in a manner of days, as they all launch on the 29th.