$100 to spend on Bambu website....

I have a P1s w/ams on the way, with $100 budget what should I order from the website to go with it. I was thinking a .4mm Hot end assembly and gears so I can print CF, many say get filament elsewhere, and get parts, (what parts?) and what does reddit recommend? (first 3d printer so not 100% sure what I will print the most of, but I do like the idea of being able to print tough and temperature resistant parts which is why I was thinking to start with the hot end)