So they would actually send collectors?
depending on the collectors they use. the ones in the UK are some of the most decent guys iv ever delt with and i even got them to team up with me against paypal XD
but most of the time they will harass you via email and phone for 3 months then they will refer it to a collection agency, now depending on the agency you could send them all the proof you have of the transaction and get them to keep referring it back to paypal, this will buy you a month each time as paypal are both useless and not expecting the collection agency to send files to them for review, the odds are the agency will come back and ask for the money again if paypal fail to respond or tell them the case is closed and they want the money. at this point id take the hit but you can always take it to you small local courts as bitcoin is legit (depending where you are) and the courts will more than likely side with you especial in the EU and UK. if its going to cost money then id recommend just paying up as for $800 its just a hassle.
id suggest getting revenge but if it is a hacked account or a fake account you could end up picking on some poor person who knows nothing about it. as people seem to inherently be retarded and use the same password for everything (yes im talking to you and you know who you are and yes its ment to be an insult) people just dont think about passwords getting compromised or hacked and there life taking a turn down shit road.
anyhow this is all what id do and is only my advice. you could aslo move and make paypal chase the money after a year or so they normally give up