Okay, so I picked up the second Mac Pro and 23" Cinema Display yesterday and just got it fired up today. It's great!
Turns out it has a 60GB OWC Mercury SSD boot drive and 3 other 1TB drives. RAM is 16gb of OWC. All else is stock.
The cosmetic condition of this machine is significantly better than the other machine I bought, so I think I'll be keeping this one and selling the other one.
I set the Mac Pro up with a clean install of El Capitan (what my other machines are running). Anything I need to do from here? Firmware updates, etc?
So now I want to be thinking about upgrades (although its running quite well as-is). I would love for any upgrade that I do to be without compromise. As an example, a video card that doesn't provide a boot screen or an SSD that can't be booted from are not options for me.
So, in light of that, I think I want to upgrade the following items eventually:
Video Card - What can I get that will run games fairly well (like Battlefield 3/4) but will also work natively with the Mac and is supported under Mojave? Don't want to spend over ~$200 here ideally.
SSD - I'd like a bigger SSD. I know there are NVMe options, etc etc, but frankly, I don't know that it would matter to me (or would it?). The current SSD is mounted in the 2nd optical drive bay and perhaps thats fine for me. Assuming that, what would you recommend? 256gb or around should be good.
Thunderbolt - yes, I know this isn't possible
I'll eventually upgrade the processor I'm sure and perhaps add more ram. For now I think those are good.
I'm stoked to have my first Mac Pro! I sincerely appreciate all of the help you guys have provided.
PS. I love the design of these old Cinema Displays with the white sides and the matte screens. Cool!
Crappy photo: