ya, I would say prob 6 hrs for two guys (to make me comfortable) PLUS rented equipment - we are talking around $750. If the soil is no good for garden, then she'll want some decent topsoil/compost to be tilled in as well. $700-900 all said and done and looking sexy! =D
If you are just starting out and are working on developing a name for yourself you might have to settle for less. But I would definitely go no less than $40/hr plus equipment rental. This is going to take you a good while.