ClassiScript was released in 2011 and aims to be one of the best classified scripts for now at a good price.
It has two beautiful designs to choose from, each with 4 different color schemes.
Also it is very well optimised for SEO, following industry’s best practices.
It has an intelligent system for fighting spam and duplicate classifieds – it can auto approve certain postings and hold suspicious looking ones for moderation. Of course you can also disable this in case you want to auto-approve all.
It supports PayPal payments for premium listings – paid classifieds can appear on top, highlighted, on homepage slider, etc.
And last, but not least – it is constantly being improved to make sure it always stays up to date. It has an avarage of one update each month which is available for free to all users.
For more details check out http://www.classiscript.com.