I agree with Smoot, I sold mine for 265m when I needed gold last year, regretted it almost instantly so started looking for a new one. Took about 2 months but I finally found one for 280m and wasn't willing to wait any longer for a cheaper one. they have gone up in price since then.
I brokered a deal for someone on Atlantic a few weeks ago who was selling theirs for 500m, the buyer said he knew it was really high but he had been looking for months and hadn't found any for sale for any price until then.
275m would be a good offer, but the person would probably want closer to 300-350 like Smoot said.