You can stake less than 5k, but you'll lose the higher bonus. I think you still receive 50$ worth of CRO if you stake 5000 CRO directly. Plus the APR, of course. And access to the Syndicate, if you want it, and some trading fees rebates. For the Syndicate, you need 5k dollars worth of trades in the last 30 days to be able to participate. I participated earlier, but gave up. I'd either have to spend too much time trading or lose on trading fees, and it's not always worth it.

You can't do supercharger if they're staked can you? I think it's one or the other.

Yes, it's one or the other. You can't touch your staked CRO on the exchange for 180 days. And if you stake more, the timer resets to 180 days from the most recent stake operation.

I need to look more closely at the card. It didn't look that good of a deal to me but a few people now have said they're really going for it.

I use it for pretty much all purchases both online and offline (not all qualify for cashback - stuff like utility bills, except for internet in my case, gas, etc. don't qualify for cashback). And I top it up with fiat using my bank-issued card.

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