Rendering 1080p on a 1440 screen.

With Black Friday coming in a few weeks I've been looking at 34" IPS ultrawide monitors. One of the major decisions I am struggling with is whether to spend the extra dosh to get the full 3440x1440 experience. Currently I am leaning toward getting a 1080 ultrawide because it wouldn't strain my gtx970 as much and I'll be upgrading from a 1920x1080p 47" tv on my desk so it's not like I'm at all spoiled for pixel density. However if a 3440 screen such as the Acer X34 could display lower resolutions quite well, then I'm more likely just to go for that and upgrade the rest of my system for it in a year or so.

Does anyone have any experience they would like to share regarding non-native resolutions on modern ultrawide monitors? With your help, I'm looking to ascend soon!