Kind of a shame that you have G-Sync. The 5700XT is the best value right now. But since you need to go with nVidia, the only other real choice is either the standard 2070, or the 2070S.
The standard 2070 can be found relatively cheaply right now considering it's being phased out. You can find it for around €100 less than the super version. The 2070S is the next best price/performance card out there. The 2080 is generally overpriced, and the 2060 and 2060S are simply not worth it for the price.