I have both the G900 and G903 and they are both GREAT mice. The main difference is that the G900 has to be charged via the cable it came with. Both mice are very responsive. Right now the prices on the G903 are lowered because new mice are coming out.
You're not an idiot. I upgraded from an Intel 7820X to a 5950X and the performance boost was pretty large. The next gen AMD series is supposed to boost by maybe 20% so your upgrade should keep you in the game for some time. The 5900X is a great CPU.
MSI MAG X570 Tomahawk Motherboard
32 GB Crucial Ballistix Elite DDR4-3600 CL16
500 GB Samsung 980 Pro for OS Drive
Corsair H115i RGB Pro XT AIO
EVGA RTX 2080 TI Black XC
Corsair HX850i PSU
Lian Li Lancool II case
Very nice, indeed! Working on purchasing parts for new build as well. Already have the x570 Tomahawk, 32 GB of DDR4-3600 CL16 from Crucial, Corsair H115i RGB Pro XT AIO and Samsung 980 Pro NvME. Waiting on finding a case and Hopefully 5900x...but availability is tough without paying scalping...
Well...I was able to order the MSI X570 Tomahawk Wifi...on it's way. Can't find 5900X anywhere. Return window on the MB is through 1/31...so I have some time to play with. Hopefully some CPU's will start showing up at MSRP after the holidays.