Simple Classifieds?

Hi all,

Need a recommendation please for using an individual Category node with sub-nodes as a community classifieds area. Formatting to make the threads more like classifieds listings would be great as would the ability for a first picture to be displayed in the thread list but only in the sub-forums of this Category.

Not looking to make money from the buying/selling here, just want to have an area that isn't simply more forums and sub-forums.

Been looking at add-ons but they seem to offer way more than I'm looking for.

Thanks in advance.