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Buyers will be interested in traffic source data and traffic stats.
PageRank won't impress anyone.
$ out for PPC versus $ in for listings, etc. have some bearing. More if you're the mother of all paid listings directories.
Put it up at the major domain forums: DNForum, DomainState, etc
IMHO, I would go to those places if I am looking to buy sites, not sell. Seen many good sites sold for peanuts, literally.
Dataguy, your answer lies in the first result itself. A complete section for site auction.
2. Ebay? Yech! Yes, there are sales that pass through the bay but reports of busted sales at Ebay are aplenty. Besides, anyone who knows the business and has money to spend at Ebay is already scanning the major domain forums.
3. IF you have traffic - and that's what a website sale is about (unless you have exceptional software to sell with the deal OR a loyal community, which may not last if you sell) - then your market will be traffic purchasers.
4. Directory scripts about. SEO abounds. Directories abound. It gets down to unique factors.
5. Exceptional IBLs that aren't "paid for" text links? That's a selling point but likely something you'll only find with a particular niche directory with other favorable factors.
Try every approach: Forums, Ebay, "for sale" sign on the directory, etc. In the forums you might reach out, politely, to traffic buyers (people buying traffic domains). A directory is not a traffic domain but if there's quality IBLs that account for traffic, etc. . . . I repeat myself . .
The site was custom designed by myself, so it is pretty unique. I have it posted for sale on DNForum, but the serious buyers seem to want to copy my programming and sell copies of my design, which I can't allow. There are other unique factors as well, and plenty of solid backlinks. It used to be impressive to say that Google has 50,000 pages of this directory indexed, but now that Google shows 190,000 pages indexed, it just doesn't mean the same thing (especially since the site only contains about 30,000 pages).
Since I don't want to sell to someone who will make copies of the site design, eBay might be the best thing since IMO many ebay buyers wouldn't know enough to make copies... but then again...
I don't see someone buying the site and not buying the script.
I don't see how you do this sale and retain control of the script without quality controls for the buyer. Assurances from someone buying it with a home address of Elbonia are problematic at best.