Sony Xperia T2 Ultra, Lumia 640 XL, Yu Yureka or OnePlus One

if ur budget is 25K go for one plus one or lumia 830. But I believe this phone is a steal at 25k and lolipop update is on its way
http://www.snapdeal.com/product/sony-xperia-z1-purple/301437538?utm_source=earth_feed&utm_campaign=12_175&utm_medium=102262926&vendorCode=Saf57c

lumia 640 xl and Yu Yureka are budget devices which can be bought at less than half the price.

Sony xperia T2 ultra is a bit overpriced given its midranged specs. Also it won't probably get Lollipop update.

In my opinion One plus one is easily the best phone, with the best buildquality too.

If you are looking for a 5.5+ inch device you can go ahead with purchase of Yureka or One Plus One, if you want the best hardware performance.

Also you can wait for Xperia M4 Aqua, if you are interested in superior sony camera, and stylish build quality. But it's display is only five inches. If you are a guy it will be more pocketable than any of the above devices as well.