Honestly I think you did great! You should check if you can get the vent and controller as a package though… I believe mine came as a pair and was cheaper.
Edit: this is what I got. I think yours is maybe a step up for the controller but mine works just fine. May be a Bluetooth vs wifi thing
AC Infinity CLOUDLINE T6, Quiet 6” Inline Duct Fan with Temperature Humidity Controller - Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics https://www.amazon.com/dp/B074XBXFPD/ref=cm_sw_r_apan_glt_fabc_BEHDF1VN8D92RK9QC3AV
There also is one (6") Somewhere on Amazon that has just a basic speed controller and is cheaper. About 110.
It's not too shabby. Granted this will be upstairs in its own dedicated bedroom furthest away from the main areas that the household spends the majority of our time in.
You definitely don't want to be in the same room with 2x of these cranked up to 10/10 on the speed setting: https://www.amazon.com/gp/product/B074XBXFPD/ref=ppx_yo_dt_b_asin_title_o04_s03?ie=UTF8&psc=1
I got this kit to seal up the window, requires some modifications of course :) https://www.amazon.com/gp/product/B07W966YNZ/ref=ppx\_yo\_dt\_b\_asin\_title\_o01\_s02?ie=UTF8&psc=1