727 transmission rebuild

All right guys I'm kind of new to this. I have a 727 that needs rebuilt. I took my car, a 1973 dart to a transmission shop. The guy said the transmission needed rebuilt. This was back in September of last year. He said it would cost around $1000 to rebuild. I talked to him a couple of days ago and he gave me a quote of over $2000. Now I'm not sure how much it really cost to rebuild this tranny but I have found some online for cheaper than that. My car is not going to be raced. It is only for daily driving. He was talking about putting in a more expensive torque converter. I guess my questions would be, what kind of torque or stall converter should I use and is the price he quoted me is reasonable for work done in Iowa