Soldato
I dont think that the 3090 is gonna be a whole bunch quicker than the 3080 - that why there were no nvidia benchmarks in the presentation.
In order of being sensible I would
1) Wait for 3080ti as this is true replacement for ti models but MLID is saying a 20Gb version might not come out
2) Buy 3080 then sell on at some loss for 3080ti -
3) Bite the bullet and buy 3090
Yeah they seem like the option's, I'm betting we won't see the Ti till June next year, seems to be the norm.