We want to help you consolidate those! Full list here for TLDs supported at launch, but we're busy working to add more before then.
https://www.cloudflare.com/tld-policies/
I wonder if the best approach would be to target registries with the most domains on CloudFlare? But my personal wish list includes .ca, .is, .to, .eco and .software :)
Likewise, .sh domains are pretty popular but an incredible pain to deal with. I managed to transfer mine to Hover, but it's expensive and buggy (you can't update your registration address, for example; you get an "internal server error").