miner software optimization might get 3090 to 150mhs...hopefully 
I pressed my Shenzen source for target selling price for 3090 but no news yet, however my local supplier hinted likely above 1k. Hmmmmm.....
3090 is the only gpu that is useful for personal use (best experience with the latest tech).
4k gaming 120 - 144 fps partnered with 32in 4k 120/144hz monitor (fps and hz in sync).
huge monitors like around 43in more or less (latest huge monitors are in 60hz refresh rate currently), huge monitors needs 8k to be an eye candy, 3090 is 60fps at 8k.
for me, good mining density starts with 1 is to 3...3 low end cards vs 1 high end card, like 3x 3090 = 9x 3070.
1 is to 2.5x is a hard choice, you might still get the 3x or more in some coins hehe.