Best rig for UE4?

Hey, everyone! I just got back from the rival engine Unity, which I must I am very impressed with. Even though, I have a potato PC, I get like 144fps. Here are my specs:

Intel Core i3 2.9GHz
4GB RAM
Intel Integrated 2500 HD (graphics driver)
14" 1080p HD monitor
Windows 7 64-bit
Single monitor

This is what I plan on upgrading to:

Intel Core i7 6th gen 4.0GHz
16GB DDR4 RAM
NVIDIA GeForce GTX 970 Ti
16" 1080p HD monitor
Windows 10 64-bit
Single monitor

Since UE4 is RAM hungry, can you please tell me what PC you are using and how it is? Do it like this:

[Processor + Speed]
[RAM]
[Graphics Driver/card]
[Monitor]
[OS]
[Number of monitors (for example, two)]
[Notes: (experience - framerate, upsides and downsides etc.)]