I am not affiliated with Laminar Research of XForcePC; just a flight simmer living downunder.
I assume you live in the USA as you quote what you are prepared to spend in dollars and you are approaching your summer period.
Firstly have a look at the minimum system requirements for a X-plane system found at http://www.x-plane.com/kb/x-plane-11-system-requirements/ Many pc builders create a rig whereby the specifications exceed the recommended requirements. No doubt this is what you intend.
I am not a computer geek but I do keep up with the latest computer components being used/recommended in building a PC suitable for X-Plane use.
Having made that statement I am of the opinion that some of your items are an overkill or under specification. The CPU needs to be faster so that it can be overclocked to a speed in the order of 4.5 GHz but the number of cores at 18 is an overkill as X-Plane only uses 4 cores. The RAM is excessive. Many experienced and dedicated users generally have 32 Gb but fast RAM. Use the 1TB SSD for running X-Plane but have a smaller SSD for the PC operating system. Even consider an additional HD rather than a SSD as a "hangar drive" for any downloaded software and as a backup for X-Plane software. Some dedicated X-Plane users use this drive for testing the Beta versions.
Personally I think you can "do better" for what you want to pay. Disregarding my thoughts, have a look at the YouTube videos created by Michael Brown from XForcePC at https://www.youtube.com/user/col2mab/videos This company is recommended by Laminar Research as the preferred supplier of PCs (refer to the X-Plane Manual) capable of running X-Plane. The link provides"good information" on lots of issues related to X-Plane. In particular have a look at the video at https://www.youtube.com/watch?v=HUgwb37NytY which is their overkill system and then the video at https://www.youtube.com/watch?v=A_5IoOCcBe8
The PC specifications for both rigs can be found at https://xforcepc.com/english/flight-simulation/flight-simulation-computers.html and if you elect to go for the top of the range overkill unit you will only spend half the amount you are prepared to spend as well as having the rig tweeked or tuned for X-Plane. Each unit can also be fined tuned for higher specification components.
Finally, what settings. If you purchase fron XForcePC the unit will be setup for optimum performance at the time of purchase. If on the other hand you build your own rig have a look at https://www.youtube.com/user/oalabdullah1/videos produced by Q8Pilot ( a dedicated X-Plane user) and in particular the video at https://www.youtube.com/watch?v=fsum5o9IEzw
An alternative video is https://www.youtube.com/watch?v=hFn-zztS5ho I have not had a complete look at this video as it is rather lengthy.
Welcome to the world of X-plane. Remember, when you purchase the new "rig" don't look backwards as you will always find a better/faster unit at a lesser cost to what you paid.
Hope this helps