I would not advise someone to randomly pick a monitor 'just because'. You have 3 things to coordinate- your use(games, movies, etc), your videocard, and your monitor. If your use and your videocard allow 1080p then 1440p monitors shouldn't even be considered.
If you have decided on a 1440p monitor, then you should also be ready to upgrade your videocard to match. Consider that part of the cost of the monitor upgrade.
If you decide to do it the cheap way and try to run it all with your current videocard, then don't be surprised if you're not happy with the results and wind up buying a videocard anyways.