Please can you help refer a plugin!! really stuck

I have an existing website 100% wordpress…I am looking for the best directory plugin that I can simply add to this website…I do not want a directory theme..just a plugin. I have over 6000 businesses to add to this directory now…so it needs to be able to handle this size effectively. I would like this plugin to have the ability for the business owners to login and edit their profile. I would also like for this plugin to have reviews built in or flexible enough to add reviews. This will be similar to Yelp. So, I need a premium plugin…and will probably need to add custom functionality to this plugin to make it work like I want it too. Does anybody have experience in creating something like this? If so, please contact me. If anybody has any advice on this…please contact me. Thanks.