Narrowing down monitors to go with new rig

Hi, All,
I'm new here. I have a new rig being built as we speak (specs at the bottom of post) and now I've got to get a monitor to go with it! I am a college professor who researches cognitive neuroscience and technology-mediated learning. In non-academic speak, it means that I play video games for a living...it's a tough life, but somebody has to do it.

I have terrible vision and I'm a migraineur so I need a monitor that make long hours in front of it bearable. I'm looking at two monitors:

Acer XB270HU bprz 27-inch WQHD NVIDIA G-SYNC (2560 x 1440) Widescreen Monitor

OR

LG Electronics UM95 34UM95 34-Inch Screen LED-Lit Monitor

Is anybody gaming on 21:9? It looks like RPG heaven.

34" would be perfect for my workflow, but is it going to give me a headache to game on (too much screen to watch? what about FOV?)?

How small is that 3440x1440 typeface (I know that I can blow it up, but is it going to get blurry on me?)?

Can I live without the 144Hz on the Acer? I did just buy an awesome computer here...I don't want to hamstring it.

Thanks for your input on my VERY FIRST post!

Specifications:
Chassis Model: Special Deal Hot Seller - Digital Storm Coridium
Exterior Finish: - Standard Factory Finish
Trim Accents: - Standard Factory Finish
Processor: Intel Core i5 4690K 3.50 GHz (Codename Devils Canyon) (Unlocked CPU) (Quad Core)
Motherboard: GIGABYTE Z97X-SLI (Intel Z97 Chipset) <br><strong></strong>
System Memory: 16GB DDR3 1600MHz Digital Storm Certified Performance Series (Highly Recommended) (Hand Tested)
Power Supply: 750W Corsair CX750M
Expansion Bay: - No Thanks
Optical Drive: DVD-R/RW/CD-R/RW (DVD Writer 24x / CD-Writer 48x)
Storage Set 1: 1x SSD (120GB Samsung 850 EVO)
Storage Set 2: 1x Storage (1TB Seagate)
Storage Set 3: - No Thanks
RAID Config: - No Thanks
RAID Card: - No Thanks
Internet Access: High Speed Network Port (Supports High-Speed Cable / DSL / Network Connections)
Graphics Card(s): 1x NVIDIA GeForce GTX 970 4GB (Includes PhysX)
Sound Card: Integrated Motherboard Audio
HPC Processor: - No Thanks
Extreme Cooling: H20: Stage 2: Digital Storm Vortex 120mm Radiator Liquid CPU Cooler (High-Performance Edition)
H20 Tube Color:- Not Applicable, I do not have a custom HydroLux liquid cooling system selected
Chassis Fans: Standard Factory Chassis Fans
Internal Lighting: - No Thanks
Airflow Control: - No Thanks
Chassis Mods: - No Thanks
Noise Reduction: - No Thanks
LaserMark: - No Thanks
Boost Processor: Stage 1: Overclock CPU 4.0GHz to 4.4GHz
Boost Graphics Card(s): - No Thanks, Please do not overclock my video card(s)
Boost Memory: - No Thanks, Please do not overclock my memory
Boost OS: - No Thanks, Please do not tweak the services on the operating system
Windows OS: Microsoft Windows 8.1 (64-Bit Edition) (FREE Upgrade to Windows 10)
Recovery Tools: Windows Recovery Toolkit (Bundled with Windows CD)
Virus Protection: FREE: McAfee AntiVirus Plus (1 Year Service Activation Card) (Not Pre-installed) ($35 Value)
Office: - No Thanks
Game: - No Thanks
Display: - No Thanks
Surge Shield: - No Thanks
Speakers: - No Thanks
Keyboard: - No Thanks
Mouse: - No Thanks
Portable Gaming: - No Thanks
Branded Gear: - No Thanks
Priority Build: - No Thanks, Ship Within 10-15 Business Days After Order Is Successfully Processed
Warranty: Life-time Expert Care with 3 Year Limited Warranty (3 Year Labor & 1 Year Part Replacement)

Thanks for your response, db188. I used this site (amongst others) to narrow down to these two. Unfortunately, I learned today from DS that my GTX970 is unlikely to power these options well, so I am back to the drawing board looking for a 1080p option.

Well, I wish that I had spoken to you on the phone then, db188 when I built the rig, because I have no idea. I went from uber-excited about the build to...it can't even run a fricking monitor. :( This has not been the greatest customer experience I have ever had. Despite three phone calls and a text chat since I posted yesterday, no one can even tell me anything conclusive about the status of my computer. I have been in Stage 1 for 8 days, but it appears that my case may have been back ordered. The guy on the phone today told me to call back on day 15(!) and see if it had come in yet! When I told him that I was considering canceling my order, my phone binged with an email that I had been moved to stage 3. The forums here had me convinced that this would be the best rig ever, but I'm just not so sure anymore. I guess I'll just have to wait and see in "an estimated 9-15 days." I'm going back to read more happy stories on the forum...

Good advice. I'm on it.

Thanks for your message, Dax. I actually have read your forum post three or four times over the last few days holding on to hope. :) Since my last post, I managed to move up to stage 5 myself. I did email management, too, but I am hoping that it was just a miscommunication and that all is well...you and I will be gaming on beautiful new rigs before we know it. (My husband, who no longer wanted me to despair either, bought me the Acer XB270HU. He said the worst that happens is that DS is right and I can't power it and we send it back and get something else. Otherwise, I'll have the monitor and the PC I want...It was a bloody brilliant solution, I think. :) )