These are all the options available as of now I believe. The dell seems nice as does the Samsung. I've heard the LG suffers from lots of backlight bleed.
I wouldn't mind getting Acer freesync since it's pretty much available (1-2 weeks eta) but I'm not sure how it perform with an Nvidia card.
I'm really itching to buy a new monitor and I've settled on ultrawide. I had my eyes on the predator x34 by acer but that one is a few months off. I've been looking around and there's a few curved ultrawides on the market albeit only 60hz. Which one of these would you guys recommend and why?