[CustomPress] Classified Ads

WPMUDEV has a lot of great tools and I feel there is enough power to do what I want but I need help with the combination. I want to create a classified ads section on a website where users can post goods and services (with images). I need to be able to charge for the service by month, quarter or year. I would also like to be able to moderate the submissions to circumvent fraud. What is the best combination of WPMUDEV plugins to accomplish this?
I have though about a membership subscription giving access to a posting blog. The clients wont actually be selling through my site, just exchanging the trade info. Thanks!