I was figuring on asking $6k for my '98 challenger 1800 as well, in another few weeks. I don't have much pics uploaded to the internet but I'd do that before posting an official classified ad, as well as take some walk-around and on the water top-speed videos and post them on youtube.
Swingy tongue trailer, newly rebuilt carbs, brand new OEM fuel pumps, both jet pumps rebuilt with new wear rings and solas concord impellers over last winter, shaft bearings verified to be within OEM spec so i didn't change those but I have them in a package anyway, original vinyl interior in good condition, nice bimini, always ran the synthetic seadoo oil, new sony marine head unit and speakers last winter, old depth finder/fish finder, nice condition original cover, the trailer has low-friction sliders on the bunks so it's easier to get on and off, new strap on the winch, the water plugs on the bottoms of the exhaust pipes were ground out and replacements were welded in and then epoxied so that won't be an issue (one started leaking right after I bought this fresh water boat, so I fixed the rest while I had the pipe out), all the lights, switches, gauges work, the front buckets slide and rotate freely, clean bilge, grant steering wheel (Oem wheel and impellers included), newer SBT engine port side from previous owner, original starboard engine, unknown hours on each, even compression numbers across all cylinders, battery cutoff switch, battery tender, new battery...etc. I'm sure there's more.
http://www.absurdflow.com/challenger.html
email can be found under the contact info on the above link.
Some small tears forming in some of the vinyl, and the port side hatch has a hairline crack in it that I fixed with marine grade 2 part epoxy for plastics, sanded smooth and both hatch covers painted black.
Considering investing in a new larger boat now that I'm sure the wife enjoys boating.