"Hello - was wondering if some of the folks have a great 1812 source
similar to P. Katchers' The Civil War Source Book?"
Asking to pick the top 5 1812 source books may be tough. I would
suggest the following as a start.
The War of 1812: Land Operations by George F.G. Stanley ISBN 0-7715-
Amateurs, To Arms by John R Elting ISBN 0-945575-08-4
The Incredible War of 1812 by J. Mackay Hitsman ISBN 1-896941-13-3
I know there are many other books and many other opinions. This list
is the place to ask.