I just finished 58 and 69 this past year. I worked on them over about 2 years, after having acquired the majority in a large lot some years prior. I found that comc.com was a great source for commons. Now, I'm not at all picky with condition, I just need it to look appealing. The higher the grade, the longer you'll wait usually, unless money isn't an option.
Collecting Orioles, Ravens, and Topps Baseball sets 57, (Finally finished 58!), 67, and 69 (need only 2!). Also, MLB HOF Autos.