[MENTION=326473]takop[/MENTION] ok, so 1440p is not in your budget. No need to look for it then.
The two options left for you are 2560x1080 (21:9, ultra wide) and 1920x1080 (16:9, Full HD)
2560x1080 is good when it comes to gaming, as the field in view is much larger, horizontally. But it looks weird when it comes to general computing (internet browsing, movies etc.) You should check out more about ultra wide resolution experience online to understand if you like it or not, because it depends on your taste. If you like it, then 2560x1080 for rs 15500 option looks good to me. However, let us know the exact monitor model because there are much more things to check out apart from native resolution, when going to buy a monitor.
1920x1080 is the most popular, today's standard resolution. Nothing to hate here if your screen size is upto 24-26". Good for gaming as well as general computing. I am currently using the same monitor which you shared earlier (LG 24MP88HM IPS Computer | LG Electronics I) and I can say its really good. Awesome color reproduction (IPS panel), good looking and matte finish.
BTW, why did you buy 1080GTX in the first place? and if you were able to afford it (>50k INR) why not a 1440p monitor (atleast!) then?
If you are gonna game at 1080p on 1080GTX, all I can say is you have set standards for everybody of being future proof!