Just as an FYI for anyone reading this thread at a later date I eneded up getting two Dell 34" U3417W's. They're basically a slightly newer version of the U3415W's. They have a sharper curve (better for dual I thought) less backlight bleed, better speakers (not a biggie but nice), thinner bezel, etc.
Anyway...so far, loving them. They come pre-calibrated like other Ultrasharps, each with their own 'calibration report.' The color seems to be very true and also the monitors very closely match each other, which is nice. The curve is also good...nothing I notice day-to-day but I bet I'd miss it if it were gone. Especially with dual screens.
Anyhow, love them and would recommend them. The only issue I have so far is that on a fresh boot they don't show a signal with Display Port, only HDMI. This seems to be kind of a common issue with 1080 Ti cards though...might just end up using HDMI.
Cheers,
Daniel