What is the best GPU i can buy ?
I have actually 790$ but i don't really know which GPU buy ? Do you have some advice ?

That's a hard a question to answer without knowing all of your PC specs. Also, scalper pricing makes getting a card at a particular price a total crapshoot.

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If you can manage to get an FE card, basically anything 3070 or better. Even a 3060ti in a pinch but if you’re in a position where you can get an FE 3060ti, I imagine there are better cards also available at that time.

3070 is my first choice, but also take into consideration what your CPU/Ram specs are too. Don't want to bottle neck your system.