Total cost can vary greatly depending on how much you do yourself. You can build your own boots for less than $40 or buy a set from a vendor for between 180-200, same for the bund, pouches, flightsuit, vest...
the hard armor is going to run you near 700$ with an uncompleted helmet and closer to 850-900 if you build a finished helmet.
So your answer is, it varies. but expect to spend between $900-1500
*Edit: beaten by a minute*