Great List John and great thread.
As for me...I only so far have completed Topps set from 1970-79 (loose no graded cards) and my main criteria/gripe was no diamond cuts/tilted card and as much as possible sharp corners and no dings...this made a real challenge because the 70's run is particularly bad for miscut cards..... taking that into account, I found the 71 (for the obvious black borders) and the 75's and 78's (really bad year for diamond cuts) to be a real challenge... also the 76's had its share of off the kilter and tilted (I must have upgraded the George Brett card at least 5 times over the years). The 73's were just tough too because it was always fuzzy in terms of picture quality...although I admit I sort of cheated on that one and bought the 3rd and 4th series from Larry Frisch collated from his vending cases when I was a kid
Ricky Y