Hardware Question!

Hello everyone! First time in the Adobe forums, hopefully the community here is great.

I work for a non-profit church organization and we are wanting to upgrade our current workstation(my home PC built back in 2010 for 1k). I've been doing a bit of reading and I currently have no time to build a PC nor to ask for one. I found some sites that do sell ready made workstations and I just really need an input or advice before we make a worthwhile investment.

Adobe Premiere Pro - Recommended Titan Computers Workstation configuration

I'm currently looking in that link and their recommended computers. I have mediocre knowledge on what I need in terms of hardware so I would like to ask for advice from the community. We are non-profit and I would really like to get the best bang for the buck.

The goals:

• Faster Render times(of course)
• No lag live playback
  • this includes multiple layers of video clips all with their own adjustment layers that contains Lumetri Color adjustments(at least one adjustment layer with a mask on opacity)
  • at least one layer of an after effects composition imported form an AE file (Title cards and Bible verses)
  • multiple layers of sound as well(not really an issue)
• and the possibility of working with 4k videos(not a priority)

Would building my own PC really be more beneficial or should I just go to the pre-built workstations?

Looking forward to your feedbacks!