You don't say how old the machine is or what its condition is, but I'm assuming it's relatively new and well maintained. With that qualifier, I agree with those who say you're a little light on your price. I'm with Mark (mksj). I would be inclined to think if it's in the condition it sounds like, you could easily get $6,500. As a comparison, a few years ago, I gave $6,000 for a very nice Vectrax mill, Made in Taiwan with all the bells and whistles on it. It was ten years old, but had only been used one year in a hobby environment, and was stored in a house for the next nine. I have a contact at MSC Direct and asked about that unit compared to a new one. She told me if it's essentially perfect (it was), it likely is a better machine than a new one. That age machine was made completely in Taiwan. The newer ones evidently have many parts made in other places. She told me even MSC doesn't know where all the parts were made. $6k was a little less than half what a comparable new one would have cost. I drove 250 miles one way to get that machine. Glad I did, and I never looked back.
Also, I don't know about your area of the country, but I suspect it's not terribly different from mine. We live in an equipment desert around here. When a good piece of equipment pops up, it's usually sold before most people ever knew it was on the market. (I sold a nice Chinese lathe about six months ago on Craig's list and had seven responses ready to buy it. First guy that called was the first one here, and he got it.) Assuming good equipment in your area is sparse, see what other comparable equipment is selling for; anticipate how yours stacks up with regard to quality and peripherals; set a price, and stick with it. Bet you'll sell it in a heartbeat.
Regards,
Terry