FizzLyfe

would change that if you're not limited to it, a pro vdh max, a pro max (non m), tomahawk max, mortar max, and the pro 4 are all really good. 
 
the 580 8 gig is usually cheaper and performs the same, though it does consume more power, but if you don't care about that, it'll do the job. 
 
seems pretty choked with not much airflow, also check the focus g. 
 
700w is way over kill, a budget unit like a cx450/550 or a system power 9 400w/500w should do the job. 
also consider the pure power 10/11 500w/400w for example, to name some. 
edit, and i just noticed this, the drive, an hdd as a boot drive is just a bad idea, an mx500 or an a2000/p1 will be a whole lot better. 

Look at prices on the RX 580 as well. It's functionally equivalent to the 5500XT, and can sometimes be had cheaper.

I think that maybe you could spend an extra buck and get a 1660 super for around £229 which I don’t know what is in your currency. If you wanted to spend even more you could get a 2060 which is a better card but at a higher price going for £300

@Darpyface
Thank you for your suggestion
That board looks alright, I'll do some research on it

I am thinking about the 580 (Explained it more in detail below). The 1650 Super though, I just glanced at a review (only one at the moment) and it seems to be outperformed even by the 1060 in quite a few games? It is pretty close to the 580 however

I know, not really considering that brand, I put it up on the list as a placeholder, to get the general feel on the overall price of the build. 
The one you linked seems pretty solid, but it's actually more expensive, about ~37 $US more. My country's pricing is really weird it seems..
 @TofuHaroto
Thanks for your suggestion,
The boards you listed seem nice, I'll definitely do some research on them - the Tomahawk does fall out of my price range though (with the current setup)

I did notice that about the 580, based on my limited research so far. But the XT is a newer card after all, I am thinking it could be a tiny bit more future-proof when it comes to optimizations? Usually the older stuff isn't a priority, as far as I know
Power consumption wise, I'd be fine with it, not an issue.
Price wise though, it would be amazing, I could put that elsewhere; better cooling for ex.

That case looks pretty good, I'll consider it.
The one I put in my list was kind of a placeholder, mainly just to get an idea for the price.

PSU: know it would be overkill, but in this case it's just a placeholder, not really considering that one in particular.
I'll check out the ones you mentioned, I am thinking I'd aim for at least 500W, or 550W - just to be sure.

I am sorry if I caused any confusion about the drives, I am not intending to use the HDD as my boot drive, the idea is to re-use the SSD from the PC that I am replacing. (A cheapo Kingston A400)
@Chris Pratt
I did check it out earlier, it's quite a bit cheaper, roughly 70 $US less - I am still somewhat considering it, but I was also thinking, the XT is a newer card after all, it probably gets more attention from the developers, optimization wise?
And it's also just a new architecture in general
But regardless, thank you for the suggestion
 
@Harlon
The 1660 Super is about ~308 $US, compared to the XT, which is ~260 $US - so it falls out of my budget, not to mention the 2060's pricing here.
I did some research about it however, it does perform pretty well - better, in fact.
But price wise, I can't do it, unless I cut corners somewhere, probably on the CPU side. (My original build plan involved an 1600AF - but it's not being sold anymore)
Thank you for your suggestion though

PCPartPicker Part List Type Item Price CPU AMD Ryzen 5 3600 3.6 GHz 6-Core Processor €174.90 @ Amazon Deutschland Motherboard ASRock B450M PRO4 Micro ATX AM4 Motherboard €69.00 @ Mindfactory Memory Corsair Vengeance LPX 16 GB (2 x 8 GB) DDR4-3200 CL16 Memory €55.90 @ Amazon Deutschland Storage Crucial P1 1 TB M.2-2280 NVME Solid State Drive €99.89 @ Amazon Deutschland Video Card Gainward GeForce GTX 1660 SUPER 6 GB Ghost Video Card €206.99 @ Mindfactory Power Supply BitFenix Formula Gold 450 W 80+ Gold Certified ATX Power Supply €64.90 @ Amazon Deutschland   Prices include shipping, taxes, rebates, and discounts     Total €671.58   Generated by PCPartPicker 2020-08-05 22:15 CEST+0200    

Having WiFi turned on but not doing anything wont have any noticeable impact on the CPU, only during active data transfer and obviously relative to how fast you are pushing it.

Oh, I see
Well, I learned something new today
 
Thank you