I think Marie's GPX is up for 1000? The market is just in a terrible position at the moment, great value for people buying though.
And, hope you don't mind me saying, but the Tip and GS are not strong selling points.
I do wish you luck with the sale, but I'm afraid to say it'll be a tough sale whatever the price.
ps, just an observation, but the ad looks good. Good photos and good detail in the description. Hard to do much more.