Not sure if this has been suggested in the past, but I have always been interested in the works of many of the Westminster Divines (such as William Twisse : http://en.wikipedia.org/wiki/William_Twisse ). Not sure if there is a lot of material out there or how difficult it would be to obtain it, but I would love to see either a large collection of the works of those people or if there is a large volume then individual sets for some of the more active writers who were part of the assembly.