Which product line for me?

I'm looking to buy sometime this summer - maybe as late as this autumn - so there's no urgency to this. I saw a reference to DigitalStorm in another forum and thought I'd check it out. Ultimately I ended up configuring a 'Slade 2' desktop but there was 1 significant problem. I need as the primary (operating system/boot) drive a 500GB SSD (NOT M.2) and in the configuration dialogue, that's not available. I have a strong preference for the Samsung Pro line SSDs but would consider an SSD in the WDC Black line. Is there another desktop (mid-tower) product line of yours I should be looking at?

This will be a Win 10 Pro computer. I do a lot of video processing and the software I use primarily works best with Intel's i5 processors (not i7 or i9). I do a LOT of backing up and will undoubtedly need to add a PCI card to give me more USB 3.0 ports (its common for me to be backing up to 5 external HDDs at once.) UNLESS you know of a case/motherboard combo that can provide me with 1/2 a dozen UBS 3.0 ports + another 4 USB 2.0 or 3.0 for stuff like speakers, mouse, keyboard, printers (wireless devices have never worked very well for me). I am not a gamer. Other than that, my computers are used for standard stuff like internet access, office work (email, document processing; spreadsheeting; some light database work), etc. I will also need the ability to connect to my cable modem via both WiFi and ethernet (RJ45). Finally, I will be installing my own internal HDDs (quantity 2) and at some point a 2nd SSD so there needs to be PSU cabling and 3 open SATA ports available to do this. I'll also have you install an Optical (DVD) drive for me so that'll use up a SATA port as well. If absolutely necessary, I can get by with 1 HDD and use an external caddy connected to a USB 3.0 port for the 2nd HDD. But the capacity to add at least 1 HDD and a 2nd SSD are 'gotta haves'.

So, my main question, to repeat, is what product line of yours should I be looking at given my needs stated above and give that a 500GB SSD is not available for your Slade 2 model?

In advance, thanks for any guidance you are able to provide to me.

P.S. Also, I strongly prefer NVIDIA GeForce graphic cards to anything based on AMD chips but given that only GeForce cards are available in the Slade 2 line, I'm guessing that's not going to be an issue. Almost forgot, 4 DIMM slots are also a must. I'll have you guys put in 16GB for me but I'll likely expand to 32GB at some point.

Thanks for that information. Looks like a phone call is in order...