I have been looking over one for a while now here in ONtairo Canada. I know it is a SUN 28 and I did manage to get some specs etc from Spencer Yachts..
So if anyone would like me to make a PDF for you.. let me know.
Also Faster made a good post in this thread to me last year 27' Sun Sloop
Yes I would agree $5000 is very fair.. boats this size and build go for $10+ out here.. but because it is little known and hard to get info.. you get a deal.