Greetings!... Generally there is a key rule... spend 15-20% of the whole system.. If you have really expensive PC, then spend good amount of money in PSU too. a budget PC user will not spend too much on PSU.
oming to you, as you said you have a GTX 1660 Super, which is a decent card, and 550watt PSU for the whole system.. Sekecting a good PSU really comes down to what best is available in your market.. Most popularly, you'll have Corsair, Coolermaster, XPG and Seasonic PSUs available in market..
For Ultra Budget Users I recommend
1) Corsair CX 550 80+ Bronze
2) Coolermaster MWE 550 Bronze V2
(both of these Models have changed a lot since they are launched. we are still not sure what exact varient of PSU's youll get in your market.)
For Mid Tear: as Availability says, Coolermaster's V750 Gold V2 looks great and Corsair RM650 is also great,
rest follow PSU tied list 2024 still, if you could provide the lest of available psus at your locality.