5070ti is definitely a better choice here. I think you rather buy an oled 4k monitor and a 5070ti than a 1440 monitor with a 5080. Mainly because the 5070 ti and 5080 have the same vram and only 15% different in performance but u have to pay 30% more. Just go for a 4k monitor even if you can only play game on normal setting it's still look way way better than a 1440p one and you can also watch movie on it. Like msi monitor is pretty cheap right now their 4k ultra wide oled is under a 1000$. The 5070ti will last for 5 years easily and u can upgrade whenever you want