Hi team, I'm new here and wanted to solicit some advice. I currently have three credit cards:

- Capital One that I've had for a decade or so
- CSP that I've had for 2 months
- Chase Freedom that I've had for 2 months

I've got the bonus for the CSP and I'm thinking about my next card. I'm mostly interested in J/F redemptions from San Francisco to other countries (Asia in particular, but Europe and South America too). Do I

1) Get the Ink Plus and continue to rack up URs? (thinking i'd go for the 50k bonus, waived AF deal)
2) Get an Amex so I can start the clock on the backdating of credit history that I've read about (and so I can diversify into MRs). I'd probably just get the Blue for Business to start (10k signup bonus, no AF) and then expand into the bigger AF cards once I start getting a bit more MRs accumulated.

Thoughts? Other cards I'm not considering that I should be?