At my job I deal with 1,200 different fonts a year. Depending on the project we might use 5-40 different fonts in it. When we look for new fonts to use we have searched high and low and usually to no avail. We have found that Dover Press has font books on a variety of genres and styles. You can also get many of these fonts as images on CD from Dover. The URL for Dover is:
I hope this helps.