I think you should seriously consider the 3070 at this time. Very barebones google searches place them in a similar price range and the 3070 offering a 45% computing power increase. If it's mainly for gaming (and you're considering doing other modern games before Arma launches) you should really really get that extra umf.
The 0080s are usually series heads and are double the price. I wouldn't go there myself unless there were no alternatives. Waiting to see what the next generation of tech will bring us and depending on the leap, you can judge what is and isn't worth it. But I think of my PCs in a 10year lifespan, ideally, with very minor upgrades (my last PC, 2010-2020, only had a GPU upgrade, and I do intense video editing).
Hope my poorly expressed ideas help you in deciding, if you haven't already.