Ben I just recently finished a 519/520 all off back set. You can see it at the Flickr link in my bio. Paying $10K for a Cross is not in the cards for me so I'll continue to upgrade and add different combos I don't have but don't see myself ever getting to 520 w/o some luck. The cards are out there. There are some that are extremely tough given pops but if you have patience they eventually turn up.
Happy to shed any light I can either here or via PM.
Best,
Scott
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