With that kind of money you can pretty much get whatever you want in terms of specs. I would recommend a PC as you can get a very powerful GPU for editing. Probably something around a GTX 1080. That GPU will run laps around any Macbook Pro setup in Adobe CC and Davinci.
Kind of a side note the reason everyone says Macbooks work so well for editing probably comes down to them using Final Cut X. This software is so well integrated with the hardware because the same company makes both that it absolutely flies in terms of speed. I still think that the components in the Macbook are not worth their price tag they charge. Just my two cents.
With your budget in the world of PC's this will get you what you need to edit smoothly and efficiently.
Add $20 US a month (not sure what it cost in your currency) for Adobe Premiere and you are golden, or use Davinci or Hit Film express for free. That laptop also has a 4K Display so you will have a little bit more work space than 1080. If you don't go with that exact model there are plenty of Laptops out there in that price range with that power.
I'm going to just go over the concept of this not your specific situation. Hopefully I will explain it well enough that you can use the info down the road.
There are a lot of factors going into disk speeds when reading footage off of drives, but I will keep it simple. First is how the drive is connected. If you are on an iMac then I assume it's going to be using Thunderbolt. So with TB3 you have 40 GB/s read and writes by the specs, the next hurtle will be how the drives are connected in the enclosure. The speed of this will most likely be 6 GB/s. Last limiting factor is the drive's speed. As already stated above spinning disk drive speeds are variable by where the data is on the disk and if it's random or sequential. Regardless the listed drive speeds are pretty close and I've found that 100MB/s is pretty average across the whole of most 7200 RPM Consumer drives.
All the techno babble aside, any multi drive enclosure with 4 or more drives running in RAID 5 or would give you roughly enough speed to meet read data rates of RED Raw 8k footage as long as the drives are 7200 RPM drives. So any of your cameras like GH4/5, FS7/5, C300 Mk II, etc. are going to give you much lower data rates. You should be fine for 95% of 4k footage coming from popular cameras today.
Getting to your drives listed in the post. Those should work as well as the drives used will be of high quality. They will have faster than average reads and writes. I would urge however that you get another drive to put this data on as a backup or use a RAID 5 enclosure. In the drives you have listed even if one of the two internal drives fails you will lose ALL YOUR DATA. RAID 0 setups are high risk/high reward type of scenario, so use caution when you have them in play.
With whatever route you choose to go I believe you will be fine as long as you aren't shooting in a Raw format. Good luck with your project and please feel free to ask if you have more questions or if I just made things confusing.
Can I ask what kind of budget you are working on? Your current set up is not going to offer much in rendering power for the current generations of the software you mentioned.
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I believe where I want to focus is working with small businesses as I am one myself. So time to dive in and focus on that.
Thanks for the insights. I'll start working the Instagram route more. I need to split my professional one and personal because right now it's a little bit of work followed by a lot of my daughter and family.
Also what are your methods for networking?