When it comes to hi resolutions
2560 x 1600 = 16:10 aspect ratio = computing and gaming.
1920 x 1080 = 16:9 aspect ratio = watching movies and videos, also it is the newer generation of desktop monitors.
2560 x 1600 is typically found on 30″ or greater LCD monitors, and are relatively expensive, and such a resolution completely destroys most graphic cards. I suggest you buy a 1080p monitor instead. If you have the money though, a 2560 x 1600 would be nice I suppose.