Replacement gaming rig

Budget:
$2500

Expectations:
Need new Gaming rig replacing I7-7700 @3.60 Ghz 16 GB Ram 64 bit GTX 1070, 1080 monitor

Usage:
Only play single person First Person Shooters. Is it better to go 1440 now (with high FPS) or bite the bullet and go 4k.

Made some changes that will help you out. Changed the case to the Lynx which saves you quite a bit of money, which left extra moolah for a couple of upgrades. Those are in the CPU and changed the Storage Drive 1 to a NVMe, same size, and upped your Ram to 32GBs. Comes in at $2675 WITHOUT the discount!
Config #3634941

Look at the config but wait until the "Master Configurator" has a look, and I am being serious. @Cretae

The big question first. There is not much reason to ever go for 4K IMO at the typical monitor sizes most everyone uses. On a 40" supermonitor, maybe, but not 24-34". There is just no quality difference that comes near justifying the HUGE difference in the price of parts. The state of video today is that high framerates are within reach of all of us, and testing has shown that means more to the eye than resoution ever can on a small screen.

Next up: the choice of platform. You may wonder...why AMD? Simple reason is AMD has completely closed the gap with Intel that has existed for 15 years. Right now, and well into march or April of next year, AMD builds are offering the next generation PCIe 4, while the Intel procs and boards are all stuck in the past with PCIe 3. It's not an enormous difference, mind you, but all parts going forward will be PCIe 4. The GPUs already are, for example. Those parts will be gimped on a soon-obsolete platform. It just makes sense to me to look forward, not back.

The next big issue that everyone mentioned is availability of parts. IMO you would never know any difference between a 5800X and a 5900X for your gaming, so why fight the issue? Simple fact is the top CPUs in either flavor these days are overpowered for gaming. The GPU does most of the heavy lifting, and all you need in a CPU is one that won't get in the way. That's basically ANY of the 5000 series AMD procs. The 5800X fits your budget.

I think both builds the guys came up with are solid and creative. The new 3060 Ti is a heckova card, and will perform very well at 1440p. The 3070 will perform better, is all. It's really a tough choice, and a central one. The difference is just 15% or so. If you're at 120 fps are you going to SEE 15fps more? Some say yes, science says most of us will not.

I have two suggestions, and both have the RTX 3070 for the better performance.

Here's the Lynx. IDK why fwfdfireman's build didn't show the RGB fans that are stock in the Lynx. But they are here. A little bling for free:

      3637034    $2382 after discount. This is the best combo of parts for the lowest price IMHO.

Here's a Lumos:

     3637041    Just a teensy bit over budget at $2574 after discount. It has the 32GB of RAM that is merely a nice-to-have and not needed for gaming yet. If you ditch that, it comes in right at $2498. Additional RAM is fairly cheap and easy to install at a later date.

The only flaw in DigitalCow's build is the DS "Performance" M.2 for primary drive. It's a SATA PCIe 3 part, and nowhere near as fast as a Firecuda NVMe. The selection of the second most expensive case here is for stronger budgets IMHO.

fwfdfireman's build is very good as well, but the inclusion of the Ryzen 5900X means an indefinite wait, and won't be a game-changer for you.

grasoline made some good points.

There's lots to think over here. I didn't make the builds with the RTX 3070s because I think the new 3060Ti doesn't have chops. Far from it! I just wanted to show you what you could do if you want to. You get all the options, and get to choose yourself what the most important ones are.

Feel free to come back with questions if you have any.

If you have the cash here's my favorite: https://www.amazon.com/gp/product/B07TD94TQF/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

I don't recall I've ever seen hoserator's recommendation cost that much. It seems it's an end-of-life premium for fans because they don't make them anymore. In it's heyday, it was def a top monitor, but I pretty distinctly recall them being around $800. It is a G-Sync only monitor. I wouldn't recommend those because they close out AMD cards which have become very competitive with Nvidia. A monitor will often outlast several GPUs, and who knows where the competition will lead? Not a good idea to close the door on half the market.

The best of both worlds is a G-Sync compatible monitor. IMO, you need not pay more than $500 for a very good one. grasoline's suggestion is a very highly regarded one of those.

So best of all would be G-Sync compatible vrs G-Sync, 144hz. I have the Cretae on order with 3070. They say AMD is backordered till January. Thanks to everyone