you doing a MHG or a stocker? do you want to run ARPS, turbo or NA? jsut a HG replace or you going to freshen some things up while ur in there. All these can affect your price. you can do a proper one for anywhere from 250-2G's, or like i did once upon a time, i replaced my HG in a shell gas station parking lot in 12 hrs for 50$.
And driftmotion is a good bet.