1) I would put it back to stock, those accessories wont add anything to a dealer/Carmax. you might be able to get a few extra $$ for selling the A/M parts on Craigslist.
2) Carfax is always helpful, if the potential buyer wants to see more, bring them to your local shop and let the shop print you a copy of their records. And if its a spotless, well maintained WRX the buyer has a chance to ask the shop any Q's with no worries.
3) Show the world the Beauty, and GLWS.
Just my .02 Cents