Record selling strategies

I've got 600+ records (LPs) I want to sell LOCALLY.  I'd rather sell to someone buying full collections (seems like less time and hassle) rather than a number of people buying a few here and there.  Is it generally a good idea to sell all the records together or should I sell each type/genre of music separately?  Should I just sell what I can sell to whoever answers my ad?  

I don't have any real collector's records as I bought records to listen to, not collect.  My listening tastes are not standard rock and roll (Stones, Who, Pearl Jam) but touch prog rock, jazz, "space music" from the 70's, classical, brass ensemble and more.  If you sold a small collection like I have I would like to hear your strategies or experiences with buyers.  If you buy small collections I would like to hear what would be attractive to buyers.  

I'm not phishing for buyers with this thread.  I'm not going to say where I live and I won't answer emails asking what I have for sale and what prices I want.  Just help me your record selling strategies. 

Thanks.