$800 is also OK, if it's a nice model in nice shape. Better to keep the original pickups and replace them if you ever sell, than it is to pocket $300. IMO. It's almost always a bad idea to fully separate original parts from an old guitar, even if you will be modding. Just put them in a drawer and let them sit as the guitar appreciates while you play it with the Duncans (or whatever you put in).
In my opinion, it's almost always a bad idea to not do exactly what you want with a guitar. I'm a player - not a collector. That Ace Frehley Budokan has been played in bars...