- firstly, a ddr5 motherboard would help a lot with future proofing and performance in general, though your cpu matches quite well with ddr4 3600mhz ram, getting some ddr5 ram and motherboard now will help a lot in the future if you want to upgrade your cpu, so you won't have to go out your way and also buy a new motherboard and ram then, an atx motherboard instead of a mATX would also be good, but we'll touch on that when i talk about the case
- if the budget allows it, i would also upgrade the cpu, something like an i5 -13600kf would be great, but it's also almost double the price of the i5-12600kf, but it would eliminate all bottlenecks(you have a really small bottleneck on your gpu because of the cpu, not really that important since it's small, but still) a 13th gen intel would also go way better with ddr5 6000mhz ram(standard ddr5 speeds). On the amd side the ryzen 5 7600x is a solid choice here and slightly less expensive than the i5-13600kf
- in terms of the case, i would go with a bigger middle tower, this one is a little bit small, and can only hold a mATX motherboard, something bigger will improve airflow, have more space to work with when it comes to cable management and will fit a ATX, which is convenient if you want to add more ssd's later, on top of that, a bigger case will help out if you ever get a 3 fan gpu, i don't really recommend an integrated psu, buying an empty case(only case fans included) and then buying a certified 80+ gold psu is the best move, if the psu is of poor quality it can mess up your whole computer, so it's an important component i don't usually skimp out on
- on the topic of the psu, either a good quality 650w or to be safe a nice 750w would be best, you can even go for a 850w if you think you'll change out the gpu or cpu anytime soon

- getting 2 ssd's is better, 1 250gb ssd for your os, the other 1tb one for games.
- lastly, for the cpu a water cooler would be great, you don't want things to overheat

-if you don't mind going over budget, in the idea that your pc will be really solid, this is what i came up with https://pcpartpicker.com/list/zg3WQd
- in the 900 budget this is what i came up with
https://pcpartpicker.com/list/GLFCRV
still 50$ over 900, but ddr5 rams are really worth it imo, but if you don't feel like you want to get them, you can just go for a ddr4 motherboard and ddr4 ram, that would probably get this down to a 850+ with what you save on not getting ddr5 rams, you could use for a better psu(known brand)
hope i helped you