edmund's shows the invoice price of a 5-door limited as $27,312 (for my area). $28,000 is probably invoice + the $725 destination charge.
The short throw shifter significantly reduces the distance to 'select' and 'shift'. In other words, the travel of the shift knob/lever when shifting. (the stock setup in the 2011 wrx's is pretty long...most people suggest getting the short throw option).
invoice for the short throw is $231