Since you are looking to put together a higher end 60's set have you taken a peek at the '62 topps? My favorite of the 60's by far, but darn those black borders. I understand your interest in the '61 fleers, a mighty good looking set. Centering was a problem as I accumulated the '68s, especially with the thin line borders around the cards, though a nice set with both leagues. To be frankly honest all the Philadelphia sets look like Wonder Bread inserts to me, but I'm probably in the minority with that opinion.

Most importantly, have fun!