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How about American Express True Cashback card?
It has Welcome offer: Enjoy 3% cash back on up to total of S$5,000 spend for first 6 months.
If you and wife both apply for individual card, it means up to S$10k spend with 3% cashback.
Applying via singsaver also gives you S$150 cash rewards. (Disclaimer: We are in the process of applying and have yet to receive this cash rewards)
Of course with Amex not widely accepted, you may want to check with your banquet venue whether they accept Amex prior to applying the card.
Brandan Chen, Financial Planner at Manulife Singapore
Answered on 11 Aug 2018
For cashback, maybe u can check out SCB, look out for roadshows, they may be able to provide you with a lower annual income limit.
For miles, check out Citi Premier Miles, min 30k Salary, and the miles do not expire
And yes, you can swipe as many cards as you want. Do take advantage of the welcome promos for both credit cards so that you maximise the benefit.