The reference book "A Dictionary of Early Christian Beliefs" has been suggested and discussed a few times on these forums for quite a long time. It's finally here! It is also within my price range. 
I'm super excited about this one! In the past, I've had to use this book in conjunction with Logos by looking up the topic that I'm interested in within the book and then searching through Logos to bring up the appropriate Early Church Father's writings. With Logos' linking, this will be no more!
Ever wonder what the Early Church Father's said about a subject? Simply look the topic up in this dictionary and click! The latest subject that I used the hard copy of this book for was concerning what the ECF's said about cremation. It made my research so much easier because the research was already done!
For a sample page that I scanned some years ago, see this post: https://community.logos.com/forums/p/37777/282966.aspx#282966
For a couple of quick discussions on this resource, I found these using Google:
Ted Hans: https://community.logos.com/forums/t/9645.aspx
Fred Morgan: https://community.logos.com/forums/t/37777.aspx
Thanks for your consideration of helping me get this into production.