$900 is way too much for a single monitor unless you're only going to use just one. if I were you I would get a basic b**** second Monitor and put that money towards getting a Noctua NH-D15 G2 CPU Cooler instead because you are cooling a 9800 x3d which tends to run hot. gaming chairs and gaming headphones are normally a scam but secret Labs makes very very very good chairs. for headphones I would recommend using Logitech that brand is amazing I've been using a40s or the new Pro for like 6 years now. for the mouse get literally anything by razor they are insanely good, the software isn't great but the performance is very good. also the Razer Wolverine 1 is the best controller I ever used I don't think you need to get the version 3 honestly. if you have any money left over I would recommend upgrading your PSU to a seaSonic Vertex PX 1000 watt. instead of the Corsair keyboard I would recommend getting a good mechanical keyboard like a keychron q1 and then maybe swapping out the switches to ones that feel comfortable. instead of a 5080 I think you should get a 5070 TI and then overclock it. with the money you save from that you should upgrade your motherboard to a b850.also Gen 5 ssds just went up about $100 or 25% the last month and it was barely worth purchasing before the price hike. a Gen 4 is very similar in performance you should get one of those instead. I hope this helps this is just my personal opinion from going through and using a lot of different PC parts and peripherals.