I have to mention this every time when someone asks for values of various coins - there cannot possibly be a site that mentions EVERY single coin. Think about it, since 1600s to modern times and for every centuary, Krause publications has a telephone directory sized catalogue, which means 4 heavy catalogues for you to read if you are interested, although it depends on what field you are interested in.
If there is such a site that could handle 4 massive telephone directory listings, most likely it would be abused and wouldn't exist much longer.
If you still insist on a website, perhaps this is the only one with modern coinage: http://(131231) Not Allowed - Auto-Removed /
My partial coin collection
http://www.omnicoin.com/collection/gxseriesMy numismatics articles and collection:
http://www.gxseries.com/numis/numis_index.htmRegularly updated at least once a month.