I had no plan other than the aesthetics and the 9.4 threshold. In hindsight, I would have gone harder at non-pedigree copies of 1-10 and gone harder at books from the 1970s when they became available. Basically choosing between a book from the 1960s and the 70s, it's always better to go for the 1970s book because they're harder. Really though, I don't think it's gone too badly even without a plan.
I agree all this. Would add, as a general rule, better to get the pricier books early as they tend to appreciate better is all. Didn't always follow this rule myself and lived to regret it. For my part, knew early on wanted very high grade run 1-100 and back in late '09 early '10 thought prices had come off enough to get back in so just started buying books as and when they became available. I share OCD traits with our DD collector brother Eric, although instead of needing OW-W as a minimum (am ok w/ OW), I focus more on overall eye appeal, especially cover registration/centering. Personally have a hard time buying a book that has white from the back cover showing on the front is all. Will do it to fill a hole but always with the view to 'upgrade' to a copy with a better cut.
Just one man's take. Only 5 issues left to complete 1-100 in desired grade (5, 37, 38, 55, 66) so wish me luck...