Special Warranty Deed and Buying from Investment Group

Looking at a property that was foreclosed in 2012, and then purchased by what I assume is a Hedge Fund/Investment Group and then rented out. 

The home has been on the market for a while, and they are only offering a Special Warranty Deed. Since it's been like 8 years since foreclosure, would it make it less risky that a lien would arise that was from an owner beforehand? 

Is there anyway that I can limit my exposure, or is that something I would just have to figure out myself with title insurance and such?

Last Question - are these investment groups flexible on price? I know they have pretty deep pockets, so just curious if anybody has had success negotiating with them.