I've been eyeing the rx 7600 from Sapphire, but it struggles with 1440p as well due to low amount of vram.
The newly announced rx 7600 xt seems to be the sweet spot for 1440p to me, since it has 12gb of vram, and slightly higher clocks, but I'll wait till the reviews and benchmarks are out.
Edit: a secondhand 3060 ti or 3070 could probably also be seen as the value king, but it depends on the state of your regional secondhand market
Right you are, dont know where I got 12gb from, been a long week