Looking to upgrade my janky twin 770 SLI setup

[Mac n Cheese]

I've been running this setup for 2 years now and I feel like it's time to move on and go to the faster single GPU setup. I mean it still runs great but I really want to future proof for AAA titles. My budget is 1000 bucks and what I'd like to know is whether I'd stick with the reference card or an aftermarket one. If aftermarket, can you guys please suggest the best one out there? I can't afford a Titan tho XD. PS: Nvidia and AMD are both welcome . Anyway, here are my specs:
Intel i7 4770K @ 4.6 ghz
Corsair H100i GTX v2
Asus Maximus VI Hero
X2 Asus GTX 770 4GB OC Edition
Kingston HyperX blu 2x8GB @ 1866 mhz
Samsung 840 EVO 120 GB SSD
Seagate 500 GB HDD
Corsair RM1000 PSU
Cooler Master Cosmos SE

 

[eWOOD29]

With $1000 I would definitely go for the GTX 1080 Ti. I would also definitely get an aftermarket for better cooling, factory overclocking, etc. The EVGA FTW or the Asus Strix's are always good.

 

[Mac n Cheese]

Would the GTX 1080 Ti handle GTA 5 Redux well? I'll run at 4K on high-ultra settings. I'd like to get at least above 70 fps

 

[Chugalug_]

A 1080 Ti for sure, and yeah, it would.
Go 4k or 1440p 144hz later down the line with a monitor like the LG 27UD58-B, or the Asus MG279Q, both of which are good value.
PCPartPicker part list / Price breakdown by merchant

Video Card: EVGA - GeForce GTX 1080 Ti 11GB FTW3 GAMING iCX Video Card ($759.99 @ Amazon)
Total: $759.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-07-19 02:15 EDT-0400

 

[Mac n Cheese]

I'm rocking a BenQ XL2420G right now and yes I'd consider upgrading to those sweet monitors in the future. Thanks for the help

 

[Chugalug_]

No problem.
You're good with your current monitor actually, not that crucial to upgrade then.