Computer Recommendations for Premiere Pro

It's time for an upgrade and I'm looking for suggestions for computers that meet all of the recommendations for optimizing found here. Things to know:

• The non-profit I work for typically uses HP or Dell but we are not tied to those brands, I just don't think IT will allow a mac in our world. 
• Ideally, I'd like to be mobile so a laptop is preference but would not rule out a desktop.
• My current system is terrible (16GB memory, Intel i7). When I asked IT to get me a quote based on the recommendations linked above, they came back with a $11,800 Dell computer. This seems crazy. I do a lot of video editing but by no means require this type of system. 

Systems requirements is a world I do not understand well enough to dive into so I appreciate any suggestions, links or thoughts. Thank you!