1440p gaming pc - upgrading from 5600x/1070

Hi, posted here a while back on possible upgrades for my PC re: MH Wilds, and decided na it might be time na for me to full on upgrade to AM5 (The PC's ~8 years old + dead end na rin naman ako sa socket, it's 5700x3d then wait if that becomes a bottleneck too)

Current build is:

Part Brand/Model
CPU Ryzen 5 5600X
CPU Cooler Thermalright Peerless Assassin 120 non-SE
SSD Patriot Viper VPN100 256GB
MOBO Gigabyte B450 Aorus M
RAM 4x8gb Patriot Steel DDR4-3200
GPU Palit GTX 1070 Dual Fan
PSU Seasonic Focus Plus Gold 650W
CASE Asus Prime AP201
Monitor 1x AOC24G2SE, 1x AOG 24G15N

With the planned upgrade, I'm hoping that the PC would be good to hold again with minimal upgrades for the next 7-8 years or so, and I'll reusing as much stuff as possible from the old rig. Here's what my shopping list is looking like now:

Part Brand/Model Price Link/Source
CPU Ryzen 5 9800X3D 31695 Bermorzone
MOBO ASRock B650M PG Riptide 10950 AyosComputer
RAM 2X16GB G.Skill Flare X5 AMD EXPO DDR5-6000Mhz 5800 AyosComputer
GPU Either an RTX 5070ti or RTX 4070ti Super probably max 50k?
Monitor 1440p144 to replace the 24G2SE ~12k or so

Usecase would be around 75-80% gaming (FFXIV, Monster Hunter World/Rise/Wilds) and 20% video encoding/rendering (Whisper/Handbrake mostly). A few questions:

  1. Will my old PSU be enough to handle the planned new build?
  2. Is there something to improve with the part choice na hindi ganun kataas ang increase sa budget? (Or can I get the parts cheaper from another source)
  3. Any monitor suggestions? max size for me is 27' (kasi hanggang dun lang kaya ng monitor arm ko haha)
  4. Is holding off for the 5070ti worth it/is the bump significant from the 4070ti Super?

Thanks!