I can do scraper which supporte Embed Firebird DB, about programing language, since you have alot of sites to scrape, i'm not sure all of them are easy, some sites such as facebook, most of data are generated by jscript which is complex and not easy to scrape in normal way, and it may need C# with special library to do it, i will accept 30$ per module event we will have to switch to C# in that case.
And no matter what language i use, the final data will be saved into firebird DB, so, its not really a big deal then.
Regards.