negotiation / waiting for the right offer

[Chris M.]

I put my condo up on zillow, for sale by owner, about a month ago to see what kind of offers I would get.  I am in no rush to move, but definately want to sell my place and get something a little bit bigger.  there hasn't been much activity, but have an interested buyer that looked at a number of places 2 days ago, and her real estate agent has let me know she likes my place and he's now asking lots of questions and sent me a comp that sold recently that was 10k less than my listed price of 95k.  

I've had many selling agents cold calling me since i listed, and 1 even said my listing price was good, that he could probably sell it and get me net what i was asking for.

At this point I wold not accept the $85k offer, and wouldnt' accept anything nearly that low, without exhausting the option of using a selling agent, to see if his promise is true.  I told this to the buying agent over email, that i was hoping to get more, and that selling agents have told me I could definately sell for more. 

I obviously want to get the most for my property, but also could use some advice on negotiation and etiquette with the buyer and agent.