Does anyone think a 5,1 with 12 core and 32GB RAM (and 1TB hdd) is worth $900 today? I saw one on sale and is wondering if I should bite. I am currently using a MacBook Pro Esc 13" (2017) and really looking to get more power in a desktop class for some light video processing. I worry the Xeons are too old and too hot (and noisy). I definitely can't afford the upcoming Mac Pro and do not think Mac Mini is good enough (is it)?
I was in the same predicament in terms of getting a desktop machine to do video and photo editing and processing and the Mac Pro 5,1 is a great upgrade over my older Mac Mini 2011 as well as my Macbook Air 2014. There are a couple of things to note. The Xeons are too old in the 4,1 and 5,1 compared to today's current Core i series found in your Macbook Pro as well as in the newer Mac Mini. And that is Quicksync -- a hardware encoding/decoding h.264 and h.265 (in newer Macs) that can encode and decode finished edited video into a final playable format. The Xeon CPU does not have Quicksync and this is the downside of the Mac Pro 5,1. The only workable solution is to use a compatible GPU and hack the Mac Pro 5,1 into using the GPU to encode/decode in h.264. Pretty much most of the video encoding/decoding is spent on creating that final h.264 video file, so you will be very disappointed with the Mac Pro 5,1 if compare Quicksync vs CPU encoding. Which is why I kept my Macbook Air because the Air could encode a 1hr 4K to 1080pHD with quicksync in 51min as opposed to my 8 core Mac Pro 5,1 in 1hr and 45min with only CPU encoding. I use Davinci Resolve and my Air just to read the projects made by the Mac Pro off the Mini's server and batch render it, while I can continue editing video on the Mac Pro.
The plus side of the Mac Pro 5,1 is its ability to accept most compatible GPU and this helps processing video footage by speeding up the rendering and the graphics part compared to a Mac that does not have one. The majority of video editing software including iMovie supports a good GPU. If the GPU has 8Gb of GDDR5 and higher, then timeline editing will be very smooth. At least smoother and quicker than your Macbook Pro. There are video processing software like Avidemux (video enhancing and up-rezing software) and Mercalli SAL Mac (a professional grade video stabilizer software better than iMovie and most FCPX/Vegas as it analyzes all motion vectors before fixing) will utilize all threads. So if you have a 12 core mac, all 24 threads will be used to speed up video enhancing and stabilizing and this will smoke your Macbook Pro 2017. Plus if you RAID your drives and install a NVMe scratch drive in the Mac Pro, it will make video production so much more efficient. These were the reasons why I didn't buy the newer Mac Mini 2018, because my Mac Pro 5,1 as it currently stands is the same as the Mini i3 2018 in multi-core performance but comes with a RX580 enough memory for 4K video editing and RAID drives for $100 cheaper than a stock base refurb 2018 Mac Mini i3 without any external RAID drives, eGPU and more RAM.
Heating management is definitely on Mac Pro's side. It just never gets too hot nor too loud fan wise even under load. Contrast that to my Mini and the Air and the spinning fan sounds like a Top Gun Maverick jet engine howling for take off during heavy loads. I had to put cooling fans on both my Macbook Air and Mini to cool them down under heavy loads or they will throttle speeds. No need for that with the Mac Pro.
In terms of pricing, I found that US prices are by far the most cheapest in terms of higher end Mac Pros. Like in your country, where I live in Canada, prices for Mac Pros are insanely high. I mean, some people are asking $600-800 Cad even for a Mac Pro 3,1 or $1700 Cad for the same Mac Pro 5,1 you're looking at, though that one comes with an aging Quadro 4000 GPU. I was lucky enough to get a loaded Mac Pro 4,1 flashed to 5,1 for the same US price in Canada, but it's pretty rare.
Another option you can do is to add an eGPU (an external GPU) to help with your light video editing. All you need is to buy a external box like the Akitio Node and a GPU (Radeon Vega 56 or RX580) and then connect it to your Macbook Pro and have the best of both worlds. You have Quicksync for encoding and you have the GPU for speeding up timeline editing.