Like DiMzz said, a RTX 2060 would be a good bet for your situation, although you might have a bit of difficulty reaching all the way up to 144 fps; doing so will probably require you to drop quality settings a bit in some of the games you play and will also ask a lot of your CPU. If you can afford it, a RTX 2060 Super might make it easier to hit 144 fps without dropping settings, and it'll also age better due to the increased amount of VRAM (8GB vs 6GB).
As far as power supplies go, wattage is a poor measurement of how good a power supply is. What is important is the platform, the system that the components of the PSU are built on and the quality of the components. If you think your PSU is sketchy, I would definitely upgrade it for your new GPU.
While the PSU that you showed in the link is very likely a step in the right direction, it is non-modular. Do you really want a whole bunch of unused SATA, Molex and floppy drive power connectors floating around in your tower?
If I were you I would consult the
Tom's Hardware Best PSUs page and make a decision based off of what you learn there.
FYI, Nvidia recommends a 500 watt PSU for the RTX 2060 and a 550 watt PSU for the RTX 2060 Super. Going over the requirement doesn't hurt though, as it might pay off the next time you buy a GPU if the power requirement is higher.