There's no card on the market that'll guarantee 100fps at 1440. I have a 2080 and there are still several games that wont do 100fps. You can get close, but no guarantees. With a $500 budget, I still think the 2070 or 5700xt would be your best bet. You'll almost be guaranteed 60+ in all but the most demanding titles.
At 1080 or? A 2070 or 5700xt will probably get you there in most titles. There will still be the few games that can't hit 100fps. Any reason you feel you need 100fps, or just a basic goal?
There's no card on the market that'll guarantee 100fps at 1440. I have a 2080 and there are still several games that wont do 100fps. You can get close, but no guarantees. With a $500 budget, I still think the 2070 or 5700xt would be your best bet. You'll almost be guaranteed 60+ in all but the most demanding titles.
For cheaper 100 - 200
Gtx 1660
Rx 570
And 300 - 500
Rtx 2060
Rtx 2070 (a little over 500 but great performance)
Rx 5700
1060 6gb evga specifically (1800ghz speed)