The browser allocates lots of RAM, so having 16GB RAM or more, would come handy. Dual monitor is no challenge, even the processors integrated graphics will do, read here:
http://www.tomshardware.co.uk/forum/349154-31-dual-monitors-intel-graphics
thank you,
what about processor.which processor would be good for me?
I found a review with intel cpu tests for browser applications and trading:
https://traderspec.com/processors-for-trading-computers/
As you can see the i3 -8350k does pretty well and costs a fracture of the high end i7. Buying a z370 motherboard you will have the possibility to upgrade in the future if necessity arise.
The AMD equivalent would be a ryzen 2600 with an AM4 motherboard.