Generally Taxi Drivers will quote you a flat rate. Feel free to bargain them down a bit, the initial price is usually a bit soft. And based on the handful of cabbies that ask if i need a ride to the airport in my random contact with them, it seems like they view it as a very desirable fare to get.
I did use Dante for my transfer from EZE (see above). He charges USD25 in either direction and I was favorably impressed. He was where he said that he would be. He speaks excellent English and is a good conversationalist - and he is funny. He also waited with me at my apartment until the agent showed up to meet me with the key - I appreciated that . . .although everything was fine I feel like he would have made sure that I wasn't left wandering the streets with my luggage.