I checked the mobo you originally picked and the power delivery was adequate (i.e. it will not bottleneck your cpu and gpu). pretty sure all these ones you linked now are perfectly fine too
nevertheless, here are some features you might actually want on a board so mby you pick based on these:
-error leds, some have leds that light up on the board to show you why your system won't boot, either separate leds for cpu/display/ram/chipset or a screen that displays an error code
this is esp useful if you don't have a 2nd Ryzen system to swap parts and test for faults
-dual bios. if you somehow manage to brick the board, which can happen during a bios update or otherwise, but it's very rare, you will have a 2nd bios that always works and that can't be changed
-if the board doesn't have wifi and bt, you can buy a dedicated pcie card for idk 30-50$ or usb dongles
I think 40 eur extra for faster ram is reasonable and it's the low profile version too, that will help when you have to install the big ass cpu cooler
gpu idk how bad you need it right now, if I had the luxury of waiting a couple of months, I'd get a gt 1030 now and when gpus drop in price, sell that for a small loss and buy what I need at close to msrp. but if you need now, get what you can afford.
as far as I can see, that case comes with 2 fans included and a controller. I would get 2 more fans, put 1 more in front to intake air and 1 up top above the cpu to exhaust. doesn't super matter what fans you get, but make sure they are pwm and the correct size (prob 120mm). they will plug into the controller box together with the included ones. pwm means they can run at non max speed, so when your pc isn't doing anything they're not blasting away for no reason and making noise
psu,ssd fine
there are tons of building guide on youtube, most should be fine, it's really not a big deal to begin with. as a few words of caution, never work inside your pc with the power on. if you have to open the case and touch stuff, unplug power supply and hold the power button for 10s or so to completely discharge the capacitors on the mobo. one more thing, when you plug everything in, if the header on a cable doesn't fit, don't blindly jam it in to infinity. take a look, mby it's not the right orientation, some are keyed so you can tell them apart, just need to look a bit before. some cables you will need to push harder on the mobo like the usb3 header and some of the connections with the buttons on the front of the case, apply a little pressure in that spot on the back of the mobo as you're trying to get them in so the board doesn't bend too much. might be the case when you're trying to mount the cooler too.
otherwise, GL
you'll be done in no time